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A delay line interferometer (DLI) can be a Mach–Zehnder interferometer or Michelson interferometer based on two-beam interference, in which one beam is
Delay_line_interferometer
Common configuration for optical interferometry
The Michelson interferometer is a common configuration for optical interferometry and was invented by the American physicist Albert Abraham Michelson in
Michelson_interferometer
Topics referred to by the same term
Durham Light Infantry, UK Donor lymphocyte infusion, immunotherapy Delay line interferometer Digital Library of India Department of Land Information, Western
DLI
end in fiber-optic communication networks. It is also known as delay line interferometer (DLI), or simply called DPSK demodulator. The DPSK decoding method
Optical_DPSK_demodulator
Measurement method using interference of waves
interferometry, interference is only achieved when the path length delays of the interferometer are matched within the coherence time of the light source. CSI
Interferometry
Type of data encoding
reverse polarity for '0'. The demodulator consists of a delay line interferometer which delays one bit, so two bits can be compared at one time. In further
Phase-shift_keying
Optical interferometer
In optics, a Gires–Tournois etalon (also known as Gires–Tournois interferometer) is a transparent plate with two reflecting surfaces, one of which has
Gires–Tournois_etalon
Gravitational wave observatory site
The Laser Interferometer Gravitational-Wave Observatory (LIGO) is a large-scale physics experiment and observatory designed to detect cosmic gravitational
LIGO
Quantum physics thought experiment
properties. In the delayed choice experiment, wave packets associated with the field propagate along both paths of the interferometer, but only one packet
Wheeler's delayed-choice experiment
Wheeler's_delayed-choice_experiment
Physics experiment
(physics) Delayed-choice quantum eraser Diffraction from slits Dual-polarization interferometry Elitzur–Vaidman bomb tester N-slit interferometer Matter
Double-slit_experiment
Relativistic effect due to rotation
Sagnac effect manifests itself in a setup called a ring interferometer or Sagnac interferometer. A beam of light is split and the two beams are made to
Sagnac_effect
American astronomical observatory
has been operational at the site since 2008. A ten-element optical interferometer that is under construction as an international scientific collaboration
Magdalena_Ridge_Observatory
Telescope in the Atacama Desert, Chile
fringe tracking and the performance of the main delay lines. Note that this only applies to the interferometer and not other instruments on Paranal. In 2005
Very_Large_Telescope
US Navy astronomical interferometer
The Navy Precision Optical Interferometer (NPOI) is an American astronomical interferometer, with the world's largest baselines, operated by the Naval
Navy Precision Optical Interferometer
Navy_Precision_Optical_Interferometer
European space mission to measure gravitational waves
The Laser Interferometer Space Antenna (LISA) is a planned European space mission to detect and measure gravitational waves—slight ripples in the fabric
Laser Interferometer Space Antenna
Laser_Interferometer_Space_Antenna
Potential for two waves to interfere
itself that is delayed by time τ {\displaystyle \tau } . A detector measures the time-averaged intensity of the light exiting the interferometer. The resulting
Coherence_(physics)
Astronomical observatory in Los Angeles County, California, US
which became fully operational in 2004 and was the largest optical interferometer in the world at its completion. Due to the inversion layer that traps
Mount_Wilson_Observatory
Arrangement of mirrors
light. They are also used in optical parametric oscillators and some interferometers. Light confined in the cavity reflects multiple times, producing modes
Optical_cavity
Autocorrelation functions realized in optics
Michelson interferometer. The detector is illuminated by the input electric field E ( t ) {\displaystyle E(t)} coming from one arm, and by the delayed replica
Optical_autocorrelation
Aspect of relativity in physics
Telescope, is under development. A space-based observatory, the Laser Interferometer Space Antenna (LISA), is also being developed by the European Space
Gravitational_wave
Physics experiment in quantum mechanics
A delayed-choice quantum eraser experiment is an elaboration on the quantum eraser experiment that incorporates concepts considered in John Archibald
Delayed-choice_quantum_eraser
Spectroscopy based on time- or space-domain data
movable mirror, which introduces a time delay—the Fourier-transform spectrometer is just a Michelson interferometer with a movable mirror. The beams interfere
Fourier-transform spectroscopy
Fourier-transform_spectroscopy
Phenomenon resulting from the superposition of two waves
double-slit experiment, laser speckle, anti-reflective coatings and interferometers. In addition to the classical wave model for understanding optical
Wave_interference
Observable quantity in imaging astronomical interferometry
technique for obtaining information about visibility phases in an interferometer when delay errors are present. Although his initial laboratory measurements
Closure_phase
Speed of electromagnetic waves in vacuum
speed of light, first by cavity resonance techniques and later by laser interferometer techniques. These were aided by new, more precise, definitions of the
Speed_of_light
Effort to find civilizations not from Earth
is designed to allow multiple observers simultaneous access to the interferometer output at the same time. Typically, the ATA snapshot imager (used for
Search for extraterrestrial intelligence
Search_for_extraterrestrial_intelligence
Large observatory in the 8–33 MHz band
shifters consisting of switchable delay lines. The telescope is a part of the URAN (Ukrainian Radio Interferometer of NASU) decametric VLBI system, which
Ukrainian T-shaped Radio telescope, second modification
Ukrainian_T-shaped_Radio_telescope,_second_modification
Signal processing filter
analogous to the z domain. Analog circuits use some form of analog delay line for the delay element. Continuous-time implementations share all the properties
Comb_filter
Comparing widely separated telescope wavefronts
distance from the radio source, and as with the short baseline radio interferometer the delays incurred by the extra distance to one antenna must be added artificially
Very-long-baseline interferometry
Very-long-baseline_interferometry
seven big telescopes on top of Mauna Kea, Hawaiʻi Big Island, in an interferometer configuration. Mauna Kea is a former volcano whose height is 13,600 ft
Ohana_project
Imaging systems using changes in phase
Engineering of Cornell University, New York. They presented a crystal interferometer, made from a large and highly perfect single crystal. Not less than
Phase-contrast_X-ray_imaging
Quantum states light can be in
quantities in laser interferometers, such as in Sagnac interferometers measuring rotation changes and in Michelson interferometers observing gravitational
Squeezed_states_of_light
light. Interference will only be achieved when the path length delays of the interferometer are matched within the coherence time of the light source. VSI
White_light_scanner
Formula for spectral line wavelengths in alkali metals
atomic physics, the Rydberg formula calculates the wavelengths of a spectral line in many chemical elements. The formula was primarily presented as a generalization
Rydberg_formula
66-telescope radio observatory in Chile
Atacama Large Millimeter/submillimeter Array (ALMA) is an astronomical interferometer of 66 radio telescopes in the Atacama Desert of northern Chile, which
Atacama Large Millimeter Array
Atacama_Large_Millimeter_Array
background polarization or by a proposed space-based gravitational-wave interferometer called the Big Bang Observer. Other tests at high redshift are constraints
Tests_of_general_relativity
Technology used to provide broadband to the end consumer via fiber
limiters, optical connects, route diversity, polarization diversity, interferometers, and coherent communication. WDMs are optical components in which power
Passive_optical_network
Two interrelated physics theories by Albert Einstein
to the Earth. Michelson designed an instrument called the Michelson interferometer to accomplish this. The apparatus was sufficiently accurate to detect
Theory_of_relativity
Restricted model of non-universal quantum computation
probability distribution of identical bosons scattered by a linear interferometer. Although the problem is well defined for any bosonic particles, its
Boson_sampling
European space observatory for astrometry (2013–2025)
"Gaia" was originally derived as an acronym for Global Astrometric Interferometer for Astrophysics. This reflected the optical technique of interferometry
Gaia_(spacecraft)
Pulse that is substantially slowed to less than the speed of light
to control delays in optical networks, permitting more orderly traffic flow. In addition, slow light can be used to build interferometers that are far
Slow_light
Former radio telescope in Puerto Rico, United States
observations of near-Earth asteroid 4769 Castalia yielded a sequence of delay–Doppler images showing two lobes in contact, providing the first observation
Arecibo_Telescope
Gravitational-wave signal detected in 2017
required combining data from the three interferometers, but this was delayed by two problems. The Virgo data were delayed by a data transmission problem, and
GW170817
femtosecond pulse measurement: electronics speed limitations. Michelson interferometer can be regarded as direct space-to-time pulse shaper since position
Femtosecond_pulse_shaping
Compact astronomical body
original on 5 December 2013. Retrieved 12 November 2013. "LISA: Laser Interferometer Space Antenna" (PDF). LISA Consortium. 20 January 2017. Archived from
Black_hole
Gravitationally lensed quasar in the constellation Lynx
Very Large Array, the Very Long Baseline Array, the Plateau de Bure Interferometer, and the Northern Extended Millimeter Array. The quasar's extreme apparent
APM_08279+5255
Concept in quantum mechanics
simple example of these "which way" experiments uses a Mach–Zehnder interferometer, a device based on lasers and mirrors sketched below. A laser beam along
Wave–particle_duality
Radio telescope in Hawaii, US
Observatory next to it to form the first submillimetre astronomical interferometer. This success was important driving the construction of the later Submillimeter
James_Clerk_Maxwell_Telescope
Decommissioned radio telescope in Hawaii, US
Three of these Leighton antennas were to be used as a millimeter-wave interferometer to be sited at Owens Valley Radio Observatory (OVRO), and the fourth
Caltech Submillimeter Observatory
Caltech_Submillimeter_Observatory
Hypothetical FTL transportation by warping space
to White, a modified Michelson–Morley interferometer could test the idea: one of the legs of the interferometer would appear to have a slightly different
Alcubierre_drive
English musician (born 1947)
spectroscopy and doppler spectroscopy of zodiacal light using a Fabry–Pérot interferometer based at the Teide Observatory in Tenerife. His research was initially
Brian_May
British-Australian astronomer (1922–1993)
electronics and the ideas that would help him later to build a sea-cliff interferometer. As World War 2 ended in 1945, HMS Unicorn shuttled cargo and personnel
John_Gatenby_Bolton
Contraction of length in the direction of propagation in Minkowski space
special relativity its explanation is as follows: In its rest frame the interferometer can be regarded as at rest in accordance with the relativity principle
Length_contraction
Imaging technique
the interferometer, and the frequency of this modulation is controlled by the speed of scanning. Therefore, translating one arm of the interferometer has
Optical_coherence_tomography
Interpretation of quantum mechanics
this extreme view, viewing splitting as decoherence driven and local, in line with other modern commentators. "Whether you can observe a thing or not depends
Many-worlds_interpretation
E and B modes (Polarisation)
the temperature of the universe is in the range of 1-30MeV - but then is delayed due to reasons of high entropy of the universe, i.e. the high value for
Polarization_(cosmology)
Interference effect of two photons
being detected in a different detector will increase. In this way, the interferometer coincidence signal can accurately measure bandwidth, path lengths, and
Hong–Ou–Mandel_effect
Active galactic nucleus (AGN) containing a supermassive black hole
visible object. Using small telescopes and the Lovell Telescope as an interferometer, they were shown to have a very small angular size. By 1960, hundreds
Quasar
Device to reflect radiation back to its source
3390/rs11192282. Schwarz, Oliver (2016-01-21). "GRACE FO Laser Ranging Interferometer". SpaceTech GmbH. Archived from the original on 2019-12-06. Retrieved
Retroreflector
Atmospheric-pressure laser ionization Atom interferometer Atom laser Atom probe Atomic clock Atomic coherence Atomic fountain Atomic line filter Atomic ratio Atomic spectroscopy
List_of_laser_articles
Fifth planet from the Sun
"Helium in Jupiter's atmosphere: Results from the Galileo probe Helium Interferometer Experiment". Journal of Geophysical Research. 103 (E10): 22815–22829
Jupiter
Foundational principle in quantum physics
beam-splitter) and the energy is given by the number of photons used in an interferometer. Although some claim to have broken the Heisenberg limit, this reflects
Uncertainty_principle
Fringe hypothesis
about a second, demonstrates that there is a delay while modelling occurs in the brain and that this delay was discovered by Libet. These slow illusions
Quantum_mind
Technique for amplifying ultrashort laser pulses
Zubarev, I G; Mironov, A B; Michailov, S I; Okulov, A Yu (1980). "Laser interferometer with wavefront reversing mirrors". Sov. Phys. JETP. 52 (5): 847. Bibcode:1980ZhETF
Chirped_pulse_amplification
wave Extratropical cyclone Extremely low frequency F wave Fabry–Pérot interferometer Faraday wave Fetch (geography) Fourier series Fraunhofer diffraction
Index_of_wave_articles
Apparent faster-than-light motion of distant astronomical objects
potential of the NASA tracking antennas for VLBI measurements and set up an interferometer operating between California and Australia. The change in the source
Superluminal_motion
Coherence time Collimated light Color Colorimetry Color science Common-path interferometer Confocal Confocal laser scanning microscopy Concave lens Concave mirror
Index_of_optics_articles
Astrophysical phenomenon
Travaglio, C.; Thielemann, F.-K. (2010). "Nucleosynthesis in Two-Dimensional Delayed Detonation Models of Type Ia Supernova Explosions". The Astrophysical Journal
Supernova
Device which holds a mirror
Such sophisticated mounts are often required for lasers, interferometers, and optical delay lines. The most common type of mirror mount is the kinematic
Mirror_mount
Electrical circuit detecting phase difference
2006-04-25. Zilic, Zeljko (2001-08-17). "Phase- and Delay-Locked Loop Clock Control in Digital Systems". TechOnLine. Archived from the original on 2006-05-15.
Phase_detector
Attraction of masses and energy
annular shapes called Einstein rings. In October 2017, the LIGO and Virgo interferometer detectors received gravitational wave signals 2 seconds before gamma
Gravity
Theory of gravitation as curved spacetime
Lämmerzahl, C.; Everitt, C. W. F.; Hehl, F. W. (eds.), Gyros, Clocks, and Interferometers: Testing Relativistic Gravity in Space (Lecture Notes in Physics 562)
General_relativity
Branch of physics seeking to explain chaotic dynamical systems in terms of quantum theory
Experiments Bell test Davisson–Germer Delayed-choice quantum eraser Double-slit Franck–Hertz Mach–Zehnder interferometer Elitzur–Vaidman Popper Quantum eraser
Quantum_chaos
Physical model of propagating energy
self-interference of a single photon. When a low intensity light is sent through an interferometer it will be detected by a photomultiplier or other sensitive detector
Electromagnetic_radiation
Quasar in the constellation of Hydra
lifetime of 100 million years. Observations by the Plateau de Bure Interferometer also showed the host's low gas mass is 2.3 ± 0.5 × 109 M☉ and it has
RX_J0911.4+0551
Extremely flat piece of optical-grade glass
mirrors or optical windows for special purposes, such as in a Fabry–Pérot interferometer or laser cavity. Optical flats have uses in spectrophotometry as well
Optical_flat
Trace radiation from the early universe
next three years, including the Very Small Array, Degree Angular Scale Interferometer (DASI), and the Cosmic Background Imager (CBI). DASI made the first
Cosmic_microwave_background
Range of physical processes in physics
Electrophoretic light scattering Extinction Haag–Ruelle scattering theory Kikuchi line Levinson's theorem Light scattering by particles Linewidth Mie scattering
Scattering
Speculative feature of the early universe
earthbound Laser Interferometer Gravitational-Wave Observatory (LIGO) and especially the space-based gravitational wave detector Laser Interferometer Space Antenna
Cosmic_string
Technique in quantum optics
Hanbury Brown, R.; Twiss, R. Q. (1956). "A test of a new type of stellar interferometer on sirius". Nature. 175 (4541): 1046–1048. Bibcode:1956Natur.178.1046H
Single-photon_source
Device that converts sound into an electrical signal
enforcement. A subtype of fiber-optic microphone uses a Fabry-Pérot interferometer as the sensing element. In these sensors, two partially reflective mirrors
Microphone
American physicist, writer, and Nobel Laureate (born 1940)
on Earth. These "signatures" are of great relevance to LIGO (Laser Interferometer Gravitational Wave Observatory), a multi-institution gravitational wave
Kip_Thorne
Retrieved 8 February 2025. Williams, Nia (2 May 2024). "Canada's long-delayed Trans Mountain oil pipeline starts operations". Reuters. "Top 100: Canada's
List_of_megaprojects
Theory of interwoven space and time by Albert Einstein
(1979). "Sensitivity analysis of the Sagnac-effect optical-fiber ring interferometer". Applied Optics. 18 (6): 915–931. Bibcode:1979ApOpt..18..915L. doi:10
Special_relativity
Private research university in Cambridge, Massachusetts, United States
MRI scans into 3D printed physical models. Beginning in 1980, Laser Interferometer Gravitational-Wave Observatory (LIGO) was designed and constructed by
Massachusetts Institute of Technology
Massachusetts_Institute_of_Technology
Non-mathematical introduction
1039/C3CP51500A. PMID 23900710. S2CID 3944699. [I]n a three-grating interferometer... We observe high-contrast quantum fringe patterns of molecules...
Introduction to quantum mechanics
Introduction_to_quantum_mechanics
Demographic of Americans
prestigious Optical Society of America for the invention of the N-slit laser interferometer. Alfredo Quiñones-Hinojosa is the director of the Pituitary Surgery
Hispanic_and_Latino_Americans
three solar masses radiated away as gravitational waves. The Laser Interferometer Gravitational-Wave Observatory (LIGO) detected the gravitational waves
History_of_black_hole_physics
Decade of the Gregorian calendar (2010–2019)
Rosetta comet mission 2015: CRISPR genome-editing method 2016: The Laser Interferometer Gravitational-Wave Observatory makes the first observation of gravitational
2010s
Wind-measuring satellite
than several hundred metres. The Mie receiver consisted of a Fizeau interferometer with a resolution of 100 MHz (equivalent to 18 m/s). The received backscatter
ADM-Aeolus
1922 physical experiment demonstrating that atomic spin is quantized
(2019-07-23). "Analysis of a high-stability Stern–Gerlach spatial fringe interferometer". New Journal of Physics. 21 (7): 073040. Bibcode:2019NJPh...21g3040M
Stern–Gerlach_experiment
Digital imaging circuit
describing the concept in April 1970 listed possible uses as memory, a delay line, and an imaging device. The device could also be used as a shift register
Charge-coupled_device
American physicist (1932–2025)
member of the Fermilab Holometer experiment, which uses a 40m laser interferometer to measure properties of space and time at quantum scale and provide
Rainer_Weiss
Attack helicopter series of the British Army
carried an AN/APG-78 Longbow fire-control radar (FCR) and Radar Frequency Interferometer (RFI), providing an integrated surveillance and attack system. The 'Longbow'
AgustaWestland_Apache
Branch of physics that studies light
precise determinations of distances or angular resolutions. The Michelson interferometer was a famous instrument which used interference effects to accurately
Optics
Hypothesis that inertial and gravitational masses are equivalent
on General Relativity "...Physicists in Germany have used an atomic interferometer to perform the most accurate ever test of the equivalence principle
Equivalence_principle
American physicist
R.; Vudyasetu, P.; Howell, J. (2007). "Slow-Light Fourier Transform Interferometer". Physical Review Letters. 99 (24) 240801. Bibcode:2007PhRvL..99x0801S
Robert_W._Boyd
Way to produce very short laser bursts
bandwidth, determined by the Q factor of the cavity (see Fabry–Pérot interferometer), is much smaller than the intermode frequency separation. In a simple
Mode_locking
Information method in electromagnetic radiation
another doppler-shift. For n round travels (e.g., n = 2 for 2-paths interferometer) and that the mirror velocity is about the same during these travels
Optical_heterodyne_detection
Property in optics
Szabó, G. (1990). "Group refractive index measurement by Michelson interferometer". Optics Communications. 78 (2): 109–112. Bibcode:1990OptCo..78..109B
Refractive_index
DELAY LINE-INTERFEROMETER
DELAY LINE-INTERFEROMETER
Girl/Female
English
Path; roadway.Lane and Laine.
Female
French
 Contracted form of French Adeline, ALINE means "little noble." Compare with another form of Aline.
Surname or Lastname
English
English : metronymic from Line.
Female
Vietnamese
Vietnamese name LIEN means "lotus flower."
Female
German
 Short form of German Helene, possibly LENE means "torch." Compare with another form of Lene.
Male
Native American
Native American Miwok name LISE means "salmon head rising above water." Compare with feminine Lise.
Female
English
Short form of French Éliane, LIANE means "sun."Â
Female
Vietnamese
Vietnamese name LINH means "spring."
Surname or Lastname
English
English : from the medieval female personal name Line, a reduced form of Cateline (see Catlin) and of various other names, such as Emmeline and Adeline, containing the Anglo-Norman French diminutive suffix -line (originally a double diminutive, composed of the elements -el and -in).French (Liné) : metonymic occupational name for a linen weaver or a linen merchant, from an Old French adjective liné ‘made of linen’.
Female
Norwegian
Danish and Norwegian form of German Liese, LISE means "God is my oath."Â Compare with masculine Lise.
Female
Welsh
 Welsh name LINN means "lake" or "waterfall." Compare with other forms of Linn.
Surname or Lastname
English
English : variant of Lind 2 and Line 1.Irish : variant of Lane 2.Scottish : habitational name from places so named in Ayrshire, Peebles-shire, and Wigtownshire.
Male
Hebrew
 Variant spelling of Hebrew Delayah, DELAYA means "God has drawn."
Female
Swedish
 Short form of Swedish Linnéa, LINN means "twin flower." Compare with other forms of Linn.
Female
English
 Variant spelling of English Aileen, ALINE means "little Eve." Compare with another form of Aline.
Female
English
 English short form of Latin Linnaea, LINN means "twin flower." Compare with other forms of Linn.
Male
Italian
Italian and Spanish form of Latin Linus, LINO means either "a cry of grief"Â or "flax, linen."
Surname or Lastname
English
English : metonymic occupational name for a dresser of flax, from Middle English lynet, lynt ‘flax’.Dutch : from a short form of a Germanic name formed with lind (see Linde 1).Dutch : metonymic occupational name for a linen weaver or merchant.
Female
Yiddish
 Yiddish name derived from the word bin(e), BINE means "bee." Compare with other forms of Bine.
Female
French
French feminine form of Roman Cælinus, CÉLINE means "heaven."
DELAY LINE-INTERFEROMETER
DELAY LINE-INTERFEROMETER
Boy/Male
Indian
Rationale, Intelligent, Rightly-guided, Having the true faith
Boy/Male
Tamil
Girven | கீரà¯à®µà¯‡à®¨Â
Language of God
Surname or Lastname
English
English : from an Old English personal name, Ä€cmann, composed of the elements Äc ‘oak’ + mann ‘man’.Probably a translated form of Swedish Ekman.
Boy/Male
Hindu
Auspicious
Girl/Female
Gujarati, Hindu, Indian, Kannada, Punjabi, Sikh, Tamil
Wisdom; Knowledge; Learning
Boy/Male
Hindu
Lord Shiva
Boy/Male
Bengali, Gujarati, Hindu, Indian, Kannada, Kashmiri, Malayalam, Marathi, Oriya, Sanskrit, Tamil, Telugu, Traditional
Peacock; Lord Krishna; Love; Fragments
Girl/Female
English American
Little bird; birdlike.
Female
English
Modern English name derived from Latin maris, MARISSA means "of the sea."
Boy/Male
Gujarati, Hindu, Indian, Kannada
Rain
DELAY LINE-INTERFEROMETER
DELAY LINE-INTERFEROMETER
DELAY LINE-INTERFEROMETER
DELAY LINE-INTERFEROMETER
DELAY LINE-INTERFEROMETER
v. t.
To mark with a line or lines; to cover with lines; as, to line a copy book.
a.
To change by fine gradations; as (Naut.), to fine down a ship's lines, to diminish her lines gradually.
pl.
of Delay
v. t.
To read or repeat line by line; as, to line out a hymn.
v. t.
To cause to decay; to impair.
n.
A supply of horses placced at stations to be in readiness to relieve others, so that a trveler may proceed without delay.
n.
One who lines, as, a liner of shoes.
n.
Gradual failure of health, strength, soundness, prosperity, or of any species of excellence or perfection; tendency toward dissolution or extinction; corruption; rottenness; decline; deterioration; as, the decay of the body; the decay of virtue; the decay of the Roman empire; a castle in decay.
n.
A linen thread or string; a slender, strong cord; also, a cord of any thickness; a rope; a hawser; as, a fishing line; a line for snaring birds; a clothesline; a towline.
v. t.
To form into a line; to align; as, to line troops.
n.
Flax; linen.
n.
The equator; -- usually called the line, or equinoctial line; as, to cross the line.
n.
A measuring line or cord.
n.
A series or succession of ancestors or descendants of a given person; a family or race; as, the ascending or descending line; the line of descent; the male line; a line of kings.
v. t.
To lay again; to lay a second time; as, to relay a pavement.
n.
Anything doubled and closed like a link; as, a link of horsehair.
n.
Cause of decay.
v. i.
To pass gradually from a sound, prosperous, or perfect state, to one of imperfection, adversity, or dissolution; to waste away; to decline; to fail; to become weak, corrupt, or disintegrated; to rot; to perish; as, a tree decays; fortunes decay; hopes decay.
superl.
Made of fine materials; light; delicate; as, fine linen or silk.
n.
Direction; as, the line of sight or vision.