light


light
That portion of electromagnetic radiation (between 390 and 770 nm) to which the retina is sensitive (wavelength range of 380–780 nm). SEE ALSO: lamp. [A.S. leoht]
- cold l. 1. SYN: bioluminescence (1). 2. fluorescent l. as opposed to incandescent l..
- invisible l. historic term for x-rays.
- minimum l. visual threshold.
- polarized l. l. in which, as a result of reflection or transmission through certain media, the vibrations are all in one plane, transverse to the ray, instead of in all planes.
- reflected l. l. directed backward from a mirror.
- refracted l. bent rays of l. changed in passage from one transparent medium to another of unequal density. SEE ALSO: refraction.
- transmitted l. l. passed through a transparent medium.
- Wood l. ultraviolet l. produced by Wood lamp.

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light 'līt n
1 a) the sensation aroused by stimulation of the visual receptors
b) an electromagnetic radiation in the wavelength range including infrared, visible, ultraviolet, and X-rays and traveling in a vacuum with a speed of about 186,281 miles (300,000 kilometers) per second specif the part of this range that is visible to the human eye
2) a source of light
light or lite adj made with a lower calorie content or with less of some ingredient (as salt, fat, or alcohol) than usual <\light salad dressing>

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(līt) the electromagnetic radiation having a velocity of about 3 Ч 1010 cm (186,284 miles) per second, and the vibrations in space being at right angles to the direction of transmission. Frequently construed as limited to the range of wavelength between 390 and 770 nanometers, which provides the stimulus for the subjective sensation of sight, but sometimes considered as including part of the ultraviolet and infrared ranges as well.

Medical dictionary. 2011.

Synonyms:

Look at other dictionaries:

  • Light — (l[imac]t), n. [OE. light, liht, AS. le[ o]ht; akin to OS. lioht, D. & G. licht, OHG. lioht, Goth. liuha[thorn], Icel. lj[=o]s, L. lux light, lucere to shine, Gr. leyko s white, Skr. ruc to shine. [root]122. Cf. {Lucid}, {Lunar}, {Luminous},… …   The Collaborative International Dictionary of English

  • light — light1 [līt] n. [ME liht < OE lēoht, akin to Ger licht < IE base * leuk , to shine, bright > Gr leukos, white, L lux & lumen, light, lucere, to shine, luna, moon, Welsh llug, gleam] 1. a) the form of electromagnetic radiation that acts… …   English World dictionary

  • Light — Light, a. [Compar. {Lighter} (l[imac]t [ e]r); superl. {Lightest}.] [OE. light, liht, AS. l[=i]ht, le[ o]ht; akin to D. ligt, G. leicht, OHG. l[=i]hti, Icel. l[=e]ttr, Dan. let, Sw. l[ a]tt, Goth. leihts, and perh. to L. levis (cf. {Levity}), Gr …   The Collaborative International Dictionary of English

  • light — Ⅰ. light [1] ► NOUN 1) the natural agent that stimulates sight and makes things visible; electromagnetic radiation from about 390 to 740 nm in wavelength. 2) a source of illumination. 3) a device producing a flame or spark. 4) (lights) traffic… …   English terms dictionary

  • Light Me Up — Студийный альбом The Pretty Reckless …   Википедия

  • Light Me Up — Álbum de The Pretty Reckless Publicación 27 de agosto de 2010 (ver Lanzamiento en el mundo) Grabación agosto de 2009 abril de 2010 …   Wikipedia Español

  • light — [adj1] illuminated ablaze, aglow, bright, brilliant, burnished, clear, cloudless, flashing, fluorescent, glossy, glowing, lambent, lucent, luminous, lustrous, phosphorescent, polished, radiant, refulgent, resplendent, rich, scintillant, shining,… …   New thesaurus

  • Light — Light, v. t. [imp. & p. p. {Lighted} (l[imac]t [e^]d) or {Lit} (l[i^]t); p. pr. & vb. n. {Lighting}.] [AS. l[=y]htan, l[=i]htan, to shine. [root]122. See {Light}, n.] 1. To set fire to; to cause to burn; to set burning; to ignite; to kindle; as,… …   The Collaborative International Dictionary of English

  • Light Up — (Japanese:美術館 bijutsukan ) is a binary determination logic puzzle published by Nikoli. As of 2006, two books consisting entirely of Light Up puzzles have been published by Nikoli.Rules Light Up is played on a rectangular grid of white and black… …   Wikipedia

  • Light — Light, v. i. [imp. & p. p. {Lighted} (l[imac]t [e^]d) or {Lit} (l[i^]t); p. pr. & vb. n. {Lighting}.] [AS. l[=i]htan to alight orig., to relieve (a horse) of the rider s burden, to make less heavy, fr. l[=i]ht light. See {Light} not heavy, and cf …   The Collaborative International Dictionary of English

  • Light — (l[imac]t), a. [AS. le[ o]ht. See {Light}, n.] [Compar. {Lighter} (l[imac]t [ e]r); superl. {Lightest}.] 1. Having light; not dark or obscure; bright; clear; as, the apartment is light. [1913 Webster] 2. White or whitish; not intense or very… …   The Collaborative International Dictionary of English

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