Search references for SLOW LIGHT. Phrases containing SLOW LIGHT
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Pulse that is substantially slowed to less than the speed of light
optics, slow light is the propagation of an optical pulse or other modulation of an optical carrier at a very low group velocity. Slow light occurs when
Slow_light
Speed of electromagnetic waves in vacuum
of air for visible light is about 1.0003, so the speed of light in air is about 90 km/s (56 mi/s) slower than c. The speed of light in vacuum is usually
Speed_of_light
Intereference effect in quantum optics
"window" which leads to "slow light", described below. It is in essence a quantum interference effect that permits the propagation of light through an otherwise
Electromagnetically induced transparency
Electromagnetically_induced_transparency
American physicist
University of Ottawa. His research interests include studies of "slow" and "fast" light propagation, quantum imaging techniques, nonlinear optical interactions
Robert_W._Boyd
Danish physicist and educator (born 1959)
team that, by use of a Bose–Einstein condensate, succeeded in slowing a beam of light to about 17 metres per second, and, in 2001, was able to stop a
Lene_Hau
2012 special relativity demonstration game
A Slower Speed of Light is a 2012 freeware video game developed by MIT Game Lab that demonstrates the effects of special relativity by gradually slowing
A_Slower_Speed_of_Light
Hypothetical solid form of light
Jaynes–Cummings model Macroscopic quantum self-trapping Slow light University of Melbourne (7 May 2007). "Could Light Behave As A Solid? A New Theory". ScienceDaily
Solid_light
Propagation of information or matter faster than the speed of light
matter travels at slower-than-light (subluminal) speed with respect to the locally distorted spacetime region. Speculative faster-than-light concepts include
Faster-than-light
Fluid which flows without losing kinetic energy
physics Fluid dynamics Macroscopic quantum phenomena Quantum hydrodynamics Slow light Supersolid Two-fluid model "The Nobel Prize in Physics 1996 – Advanced
Superfluidity
Optical phenomenon
phenomenon in which slow light is passed through a Bose–Einstein condensate that is itself spinning faster than the local speed of light within to create
Optical_black_hole
Type of warship
however, light carriers were intended for higher speeds to be deployed alongside fleet carriers, while escort carriers were typically relatively slow and usually
Light_aircraft_carrier
Information sent faster than light
faster-than-light communication via a subtle control over the state of entangled particles is possible, but for practical purposes extremely slow and expensive:
Faster-than-light communication
Faster-than-light_communication
Electromagnetic radiation humans can see
Light, visible light, or visible radiation is electromagnetic radiation that can be perceived by the human eye. Visible light spans the visible spectrum
Light
2026 action-adventure video game
Light's 20-hour runtime resulted in some sections that were significantly slower than others. Amelia Schwanke of TechRadar lavished 007 First Light's
007_First_Light
2018 studio album by Still Corners
Slow Air is the fourth studio album by London-based dream pop band Still Corners. It was released 17 August 2018 by Wrecking Light. All tracks written
Slow_Air
published in Fall 2007, and his latest volume, Slow Light: Invisibility, Teleportation, and Other Mysteries of Light, was published in 2011. Perkowitz has also
Sidney_Perkowitz
Hypothetical travel into the past or future
travel no faster than c in a vacuum. His experiment involved slow light as well as passing light through a vacuum. He generated two single photons, passing
Time_travel
Indian physicist and administrator
estimated. This was followed by the design of photonic crystal structure for slow light generation leading to formation of soliton at incredibly low power, design
Ravindra Kumar Sinha (physicist)
Ravindra_Kumar_Sinha_(physicist)
State of matter
from a light pulse such that they recorded the light's phase and amplitude, recovered by a second nearby condensate, in what they term "slow-light-mediated
Bose–Einstein_condensate
Genus of primates from Southeast Asia
Sunda slow loris (N. coucang), Bengal slow loris (N. bengalensis), Javan slow loris (N. javanicus), Philippine slow loris (N. menagensis), Bangka slow loris
Slow_loris
(and inclination), the "fast" light given off during approach would be able to catch up with and even overtake "slow" light emitted earlier during a recessional
De Sitter double star experiment
De_Sitter_double_star_experiment
Form of sleep involving negligible eye movement
Medicine (AASM). Stage 1 – occurs mostly in the beginning of sleep, with slow eye movement. This state is sometimes referred to as relaxed wakefulness
Non-rapid_eye_movement_sleep
American theoretical physicist (born 1945)
the idea of using slowed light to reduce the energy, writing that, "For a time, I considered the possibility that slowing down light might increase the
Ronald_Mallett
Photography using a long-duration shutter speed
scenery), a slow shutter speed can cause interesting effects, such as light trails. Long exposures are easiest to accomplish in low-light conditions but
Long-exposure_photography
Velocity at which the overall shape of a wave's amplitudes propagates
dispersion Group delay dispersion Phase delay Phase velocity Signal velocity Slow light Front velocity Matter wave#Group velocity Soliton Nemirovsky, Jonathan;
Group_velocity
Physical phenomenon relating to the direction of waves
c. When light enters a slower medium at an angle, one side of the wavefront is slowed before the other. This asymmetrical slowing of the light causes it
Refraction
2020 studio album by the Acacia Strain
Slow Decay is the tenth studio album by American metalcore band the Acacia Strain. It was released on July 24, 2020, through Rise Records, though originally
Slow_Decay
back to top back to top Potentially slow rotators have their rotation period estimated based on a fragmentary light curve. They are listed separately from
List of slow rotators (minor planets)
List_of_slow_rotators_(minor_planets)
Television genre
Slow television, or slow TV (Norwegian: sakte-TV), is a genre of "marathon" television coverage of an ordinary event in its complete length. Its name is
Slow_television
American electrical engineer
CLEO program co-chair in 1997 and general co-chair in 1999, OSA Slow and Fast Light Topical Meeting program co-chair in 2006 and general co-chair in
Constance_J._Chang-Hasnain
Lighthouse in New York, United States
York SP Fire Island Light Station. National Archives and Records Administration. Retrieved November 30, 2025. (Downloading may be slow.) Stephen Olausen
Fire_Island_Lighthouse
American businessman
Christopher; Hau, Lene Vestergaard (2004). "The art of taming light: ultra-slow and stopped light". Europhysics News. 35 (2): 33–39. doi:10.1051/epn:2004201
Christopher_Slowe
Practical physics application
shape are required to efficiently emit light. A LED is a long-lived light source, but certain mechanisms can cause slow loss of efficiency of the device or
Light-emitting_diode_physics
Lighthouse
MPS Race Rock Light Station. National Archives and Records Administration. Retrieved November 28, 2025. (Downloading may be slow.) Light List, Volume I
Race_Rock_Light
Genre of art cinema
Slow cinema (sometimes called contemplative cinema) is a genre of art cinema characterised by a style that is minimalist and observational, with frequent
Slow_cinema
Intentional reduction of reading speed
Slow reading is the intentional reduction in the speed of reading, carried out to increase comprehension or pleasure. The concept appears to have originated
Slow_reading
Australian Photographer (born 1957)
Marcos, TX 2012 – Painted Light, Goodwin Fine Art, Denver, CO 2011 – Slow Light, Etherton Gallery, Tucson, AZ 2011 – Painted Light, McMurtrey Gallery, Houston
Kate_Breakey
Spanish photonics engineer
topological photonics, quantum optics, nanophotonics, photonic crystals, and slow light. Blanco-Redondo earned a master's degree in electrical engineering at
Andrea_Blanco-Redondo
American physicist, chemist and engineer
PhD for her thesis entitled "Manipulations with spatially compressed slow light pulses in Bose–Einstein condensates" with Lene Hau as her thesis advisor
Naomi_Ginsberg
Study of matter-light interactions at small scales
transparency by S. E. Harris and of slow light by Harris and Lene Vestergaard Hau. Researchers in optical physics use and develop light sources that span the electromagnetic
Atomic, molecular, and optical physics
Atomic,_molecular,_and_optical_physics
University, School of Engineering and Applied Sciences researching ultra-slow and stopped light in Bose-Einstein Condensates with Prof. Lene Vestergaard Hau. Garner
Sean_R._Garner
with high reflectivity at oblique incident angle. Applications such as slow light and optical switch can be built on the hollow-core waveguide by using
High_contrast_grating
Effect in filmmaking
Slow motion (commonly abbreviated as slow-mo or slo-mo) is an effect in film-making whereby time appears to be slowed down. It was invented by the Austrian
Slow_motion
Topics referred to by the same term
electronic music group Freescha; A Slower Speed of Light, a 2012 freeware video game developed by MIT Game Lab; Slower Speeds Initiative, a coalition "to
Slower
1966 science fiction short story by Bob Shaw
Analog Science Fiction and Fact. The story uses the idea of "slow glass": glass through which light takes years to pass. Bob Shaw used this idea again in later
Light_of_Other_Days
1999 EP by Godspeed You! Black Emperor
Slow Riot for New Zero Kanada E.P. (stylised as Slow Riot for New Zerø Kanada E.P.) is the only EP and second release by Godspeed You! Black Emperor. It
Slow Riot for New Zero Kanada E.P.
Slow_Riot_for_New_Zero_Kanada_E.P.
Paper embrittlement of a book or document
Slow fire or acid decay is a term used in library and information science to describe paper embrittlement resulting from acid decay. The term is taken
Slow_fire
Japanese light novel series
"J-Novel Club Licenses 4 New Light Novels, 3 New Manga". Anime News Network. Retrieved February 23, 2026. "Enough with This Slow Life! I Was Reincarnated
Enough with This Slow Life! I Was Reincarnated as a High Elf and Now I'm Bored
Enough_with_This_Slow_Life!_I_Was_Reincarnated_as_a_High_Elf_and_Now_I'm_Bored
American drama limited series
All the Light We Cannot See is an American historical drama television miniseries directed by Shawn Levy and developed by Steven Knight for Netflix. Based
All the Light We Cannot See (miniseries)
All_the_Light_We_Cannot_See_(miniseries)
American physicist (born 1961)
performed fundamental studies on propagation of ultrashort laser pulses and slow light. He also pioneered nonlinear optics in gas-filled hollow-core photonic
Alexander_Gaeta
Type of variable star
slow irregular variable (ascribed the GCVS types L, LB and LC) is a variable star that exhibit no or very poorly defined periodicity in their slowly changing
Slow_irregular_variable
Compact astronomical body
outside observer. All processes on this object would appear to slow down, and any light emitted by the object to appear redder and dimmer, an effect known
Black_hole
Atmospheric effect caused by the solar wind
An aurora (pl. aurorae or auroras) is a natural light display in Earth's upper atmosphere caused by charged particles from the Sun colliding with atoms
Aurora
English television presenter and journalist (born 1963)
Gear in its second series in 2003, where he earned the nickname "Captain Slow" owing to his careful driving style, and his OCD-like obsessions with order
James_May
Swiss physicist who specializes in fibre optics
Brillouin scattering, he was able to demonstrate the generation of slow and fast light in optical fibres. Since 2007 he has been visiting professor at Shanghai
Luc_Thévenaz
Measured time difference as explained by relativity theory
greater the time dilation between them, with time slowing to a stop as one clock approaches the speed of light (299,792,458 m/s). In theory, time dilation would
Time_dilation
New Zealand actress
a New Zealand actress. She is known for her performance in the 2015 film Slow West. Pistorius was born in Rustenburg, South Africa. Her family moved to
Caren_Pistorius
Device capable of storing light
technological implementation of this buffer, and try to reduce the size by using slow-light devices. The other is to better overall performance, by using stochastics
Optical_buffer
Semiconductor light source
A light-emitting diode (LED) is an electronic component that uses a semiconductor to emit light when current flows through it. Electrons in the semiconductor
Light-emitting_diode
Musical artist
It was produced by ex-Suede guitarist Bernard Butler. His third album, Slow Light, was co-produced with Danish producer Tobias Wilner (Blue Foundation)
Findlay_Brown
2012 studio album by Amy Macdonald
artwork numbered prints Sheet music for "Slow It Down" "Amy Macdonald guitar pic" "Life in a Beautiful Light". 13 April 2012. Archived from the original
Life_in_a_Beautiful_Light
Hypothetical faster-than-light particle
their energy decreases, and would require infinite energy to slow to the speed of light. No verifiable experimental evidence has been found to support
Tachyon
Japanese light novel series
Drugstore in Another World: The Slow Life of a Cheat Pharmacist is a Japanese light novel series written by Kennoji. It was serialized online between
Drugstore_in_Another_World
Greek physicist
Foteinopoulou is a Greek physicist specializing in optics, including slow light and photonics. She is a research professor in the Department of Electrical
Stavroula_Foteinopoulou
American physicist (1947–2025)
August 20, 2025. Povinelli, Michelle. "Characteristics of defect modes, slow light, and disorder in photonic crystals". MIT Libraries. Retrieved August 20
John_Joannopoulos
Musical artist
Original Soundtrack – Tobias Wilner, Dead People's Choice Records 2016: Slow Light – Findlay Brown, Nettwerk 2016: Blood Moon – Blue Foundation, Dead People's
Tobias_Wilner
1996 studio album by Fuck
Pretty...Slow is an album by the American indie rock band Fuck, and their first to see wide release. It was released by their own label, Rhesus Records
Pretty...Slow
American mixed martial artist (born 1987)
the Light Heavyweight Champion from 2011 to 2015 and from 2018 to 2020, and the Heavyweight Champion from 2023 to 2025, as well as the interim Light Heavyweight
Jon_Jones
Lighthouse in Staten Island, New York
(Downloading may be slow.) Light List, Volume I, Atlantic Coast, St. Croix River, Maine to Shrewsbury River, New Jersey (PDF). Light List. United States
Staten_Island_Light
Obsolete physics theory
approaching star's "fast" signal to catch up with and overtake the "slow" light that it had emitted earlier when it was receding, then the image of the
Emission_theory_(relativity)
Lighthouse
MPS Tibbetts Point Light. National Archives and Records Administration. Retrieved November 1, 2025. (Downloading may be slow.) Light List, Volume VII,
Tibbetts_Point_Light
Campaign for local flower industry
Slow Flowers is a movement promoting the support and purchase of American-grown flowers in the United States. Similar to the Slow Food movement—aimed
Slow_Flowers
Concept in relativity theory
directly establish the isotropy of the one-way speed of light since it has been shown that slow clock-transport, the laws of motion, and the way inertial
One-way_speed_of_light
effects at optical wavelengths. More recently, his research has been to use slow-light in photonic crystal waveguides in order to improve the performance of
Thomas_F_Krauss
2023 studio album by Matchbox Twenty
in a Slow Dream)". The album debuted at number 53 on the US Billboard 200 with 13,000 album-equivalent units in its first week. Where the Light Goes is
Where_the_Light_Goes
Third planet from the Sun
855 mi)—1.28 light seconds—and is roughly a quarter as wide as Earth. The Moon's gravity helps stabilize Earth's axis, causes tides and gradually slows Earth's
Earth
2025 video game
Dying Light: The Beast is a 2025 survival horror video game developed and published by Techland. Originally envisioned as a downloadable content pack
Dying_Light:_The_Beast
Acoustic analogue of a black hole in which sound plays the role of light
condensate. Gravity analogues other than phonons in a fluid, such as slow light and a system of ions, have also been proposed for studying black hole
Sonic_black_hole
Species of primate
fur on its back, light-colored facial features, as well as the shape and width of the stripes of its facial markings. As with other slow lorises, this arboreal
Nycticebus_bancanus
Atmospheric neutrino oscillation established 1999 – Lene Vestergaard Hau: Slow light experimentally demonstrated 2000 – Quark-gluon plasma found 2000 – Tau
Timeline of fundamental physics discoveries
Timeline_of_fundamental_physics_discoveries
Quantum-mechanical version of computer memory
absorption and refraction at the resonant frequencies of atomic transitions. Slow light, optical storage, and quantum memories can be achieved based on EIT. In
Quantum_memory
Lighthouse
(Downloading may be slow.) Light List, Volume I, Atlantic Coast, St. Croix River, Maine to Shrewsbury River, New Jersey (PDF). Light List. United States
Stony_Point_Light
2003 single by Twista
stated that "Slow Jamz" is a "tribute to old-school R&B love songs", and highlighted West's line as an instant classic, "She got a light-skinned friend
Slow_Jamz
Galaxy containing the Solar System
the name describing the galaxy's appearance from Earth: a hazy band of light seen in the night sky formed from stars in other arms of the galaxy, which
Milky_Way
2005 single by Kanye West
With its light groove, the song significantly marked West giving a "cautionary rap" to those who came from his area. Musically, "Drive Slow" is a hip
Drive_Slow
2016 studio album by Kuedo
Slow Knife is the second studio album by English record producer Jamie Teasdale under the pseudonym Kuedo. It was released on 14 October 2016 through Planet
Slow_Knife
2023 single by Matchbox Twenty
"Wild Dogs (Running in a Slow Dream)" is a song by the American alternative rock band Matchbox Twenty. It was released on March 17, 2023, as the first
Wild Dogs (Running in a Slow Dream)
Wild_Dogs_(Running_in_a_Slow_Dream)
American physicist and nanophotonics researcher
completed a Ph.D. in physics titled Characteristics of defect modes, slow light, and disorder in photonic crystals at the Massachusetts Institute of Technology
Michelle_Povinelli
Italian physicist
equipment company. Her research has involved optical chaos, rogue waves, slow light, holographic interferometry, and pattern formation in nonlinear optics
Stefania_Residori
travel no faster than c in a vacuum. His experiment involved slow light as well as passing light through a vacuum. He generated two single photons, passing
Shengwang_Du
2004 single by Jeff Bates
"Long, Slow Kisses" is a song recorded by American country music artist Jeff Bates. It was first included on his 2003 debut album Rainbow Man. Bates re-recorded
Long,_Slow_Kisses
Light-conducting fiber
with an index around 1.4475. The larger the index of refraction, the slower light travels in that medium. From this information, a simple rule of thumb
Optical_fiber
Speed at which the first rise of a pulse above zero moves forward
amplitude and builds up. Peter W. Milonni (2004). Fast light, slow light and left-handed light. CRC Press. pp. 26 ff. ISBN 978-0-7503-0926-4. Julius Adams
Front_velocity
2013 studio album by the Pastels
back to at least 2008, whilst versions of "Wrong Light" and "Slow Summits" (by then known as "Slowly Taking Place") were recorded for Marc Riley in March
Slow_Summits
Australian scientist & academic
breakthrough achievements in the nonlinear optics of periodic media, slow-light in photonic crystals and ultrafast planar waveguide nonlinear optics.
Ben_Eggleton
Optical property
Hughes, Ifan G. (2009). "A gigahertz-bandwidth atomic probe based on the slow-light Faraday effect". Nature Photonics. 3 (4): 225. arXiv:0811.2316. Bibcode:2009NaPho
Verdet_constant
Form of electromagnetic radiation
sometimes called ultraviolet light) is electromagnetic radiation of wavelengths of 100–400 nanometers, shorter than that of visible light, but longer than X-rays
Ultraviolet
Danish physicist
photonic-crystal fibers, slow light photonic crystals, and plasmonics. He is known for his contributions to understanding nonlocal light–matter interactions
N._Asger_Mortensen
Art and practice of creating images by recording light
creating images by recording light, either electronically by means of an image sensor, or chemically by means of a light-sensitive material such as photographic
Photography
Period of sleep in humans and other animals
characterised by slow delta waves. Slow-wave sleep usually lasts between 70 and 90 minutes, taking place during the first hours of the night. Slow-wave sleep
Slow-wave_sleep
SLOW LIGHT
SLOW LIGHT
Girl/Female
Tamil
Himavathi | ஹிமாவதீ
Snow
Himavathi | ஹிமாவதீ
Girl/Female
American, Australian, Chinese, Latin, Spanish
Snowy; Covered with Snow; Snow-covered; Snowfall; Snow-capped; Snow-clad; Snow Capped
Surname or Lastname
English (Lancashire)
English (Lancashire) : unexplained.Perhaps an Americanized spelling of Schau.
Boy/Male
Gujarati, Hindu, Indian, Punjabi, Sikh
Glow; Light
Surname or Lastname
English
English : unexplained; possibly a variant of Flew, a metonymic occupational name for a fisherman, from Middle English flue, denoting a kind of fishing net.
Surname or Lastname
English
English : variant of Stowe.
Boy/Male
Hindu, Indian
Slow
Boy/Male
Tamil
Manju Prasanna | மஂஜ௠ பà¯à®°à®¸à®¨à¯à®¨Â
Snow
Manju Prasanna | மஂஜ௠ பà¯à®°à®¸à®¨à¯à®¨Â
Surname or Lastname
English
English : variant of Clough.English : metonymic occupational name for a nailer, from Old French clou ‘nail’. Compare Clower.Possibly an Americanized spelling of German Klau, a habitational name for someone from Klau near Aachen or Clauen in Lower Saxony, or Glau, a nickname for an astute person, from Old High German, Low German glou, glau ‘circumspect’.
Boy/Male
Indian
Chant; Mantra
Surname or Lastname
English and Scottish
English and Scottish : topographic name for someone who lived near a tumulus, mound or hill, Middle English lowe, from Old English hlÄw (see Law 2).Scottish and English : nickname for a short man, from Middle English lah, lowe (Old Norse lágr; the word was adopted first into the northern dialects of Middle English, where Scandinavian influence was strong, and then spread south, with regular alteration of the vowel quality).English and Scottish (of Norman origin) : nickname for a violent or dangerous person, from Anglo-Norman French lou, leu ‘wolf’ (Latin lupus). Wolves were relatively common in Britain at the time when most surnames were formed, as there still existed large tracts of uncleared forest.Scottish : from a pet form of Lawrence. Compare Lowry 1.Americanized spelling of Jewish Lowe.
Boy/Male
African, Hindu, Indian, Punjabi, Sanskrit, Sikh, Swahili
Slow; Firm
Boy/Male
British, English
Laurel
Surname or Lastname
English
English : nickname denoting someone with very white hair or an exceptionally pale complexion, from Old English snÄw ‘snow’.Americanized and shortened form of any of the Jewish ornamental names composed with German Schnee, Schnei, Schneu ‘snow’ as the first element.
Surname or Lastname
English
English : from Middle English blowe, blaa, bloo ‘pale’, hence a nickname for someone with an exceptionally pale complexion.Americanized spelling of French Bleau.
Boy/Male
Indian, Sanskrit
Not Slow; Agile; Rapid
Boy/Male
Indian, Sanskrit
Making Slow Progress
Girl/Female
Welsh
Slow.
Girl/Female
Indian, Telugu
Slow and Steady
Girl/Female
Indian
Grateful
SLOW LIGHT
SLOW LIGHT
Girl/Female
Muslim
Young palm tree
Boy/Male
Muslim
Secure. Safe. Mild. Free.
Boy/Male
Hindu
Boy/Male
Indian, Telugu
King of Man; Lord of Men
Girl/Female
Indian, Traditional
Goddess Lakshmi
Boy/Male
Indian
Praised, Commendable
Girl/Female
Indian
Divine
Surname or Lastname
English
English : variant spelling of Oakes.Americanized form of Jewish Ochs.
Girl/Female
Polish
Christian.
Girl/Female
Australian, Greek, Latin
Golden; Dawning
SLOW LIGHT
SLOW LIGHT
SLOW LIGHT
SLOW LIGHT
SLOW LIGHT
superl.
Not loud; as, a low voice; a low sound.
superl.
Not ready; not prompt or quick; dilatory; sluggish; as, slow of speech, and slow of tongue.
n.
A side or incidental blow; an accidental blow.
v. t.
To exhibit or present to view; to place in sight; to display; -- the thing exhibited being the object, and often with an indirect object denoting the person or thing seeing or beholding; as, to show a house; show your colors; shopkeepers show customers goods (show goods to customers).
superl.
Not advancing or improving rapidly; as, the slow growth of arts and sciences.
superl.
Moving a short space in a relatively long time; not swift; not quick in motion; not rapid; moderate; deliberate; as, a slow stream; a slow motion.
n.
A sow bug.
n.
A stream of water or other fluid; a current; as, a flow of water; a flow of blood.
v. t.
To scatter like snow; to cover with, or as with, snow.
v. t.
To transport in a scow.
v. t.
To form by inflation; to swell by injecting air; as, to blow bubbles; to blow glass.
v. t.
To clear of contents by forcing air through; as, to blow an egg; to blow one's nose.
v. t.
To put out of breath; to cause to blow from fatigue; as, to blow a horse.
n.
A low-lying piece of watery land; -- called also flow moss and flow bog.
v. t.
To render slow; to slacken the speed of; to retard; to delay; as, to slow a steamer.
superl.
Behind in time; indicating a time earlier than the true time; as, the clock or watch is slow.
v. t.
To bestow; to confer; to afford; as, to show favor.
superl.
Moderate; not intense; not inflammatory; as, low heat; a low temperature; a low fever.
superl.
Wanting strength or animation; depressed; dejected; as, low spirits; low in spirits.