| luminiferous | Producing or conveying light. Origin: L. Lumen, light, + fero, to carry (05 Mar 2000) |
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| luminol | Compound used as a bystander substrate in assaying the metabolic activation of leucocytes by chemiluminescence. When oxidized by the myeloperoxidase/hydrogen peroxide system, it emits light. (18 Nov 1997) |
| luminophore | An atom or atomic grouping in an organic compound that increases its ability to emit light. Origin: L. Lumen, light, + G. Phoros, bearing (05 Mar 2000) |
| luminous | 1. Shining; emitting or reflecting light; brilliant; bright; as, the is a luminous body; a luminous colour. "Fire burneth wood, making it . . . Luminous." (Bacon) "The mountains lift . . . Their lofty and luminous heads." (Longfellow) 2. Illuminated; full of light; bright; as, many candles made the room luminous. "Up the staircase moved a luminous space in the darkness." (Longfellow) 3. Enlightened; intelligent; also, clear; intelligible; as, a luminous mind. " Luminous eloquence." . " A luminous statement." Luminous paint, a paint made up with some phosphorescent substance, as sulphide of calcium, which after exposure to a strong light is luminous in the dark for a time. Synonym: Lucid, clear, shining, perspicuous. Luminously, Luminousness. Origin: L. Luminosus, fr. Lumen light: cf. F. Lumineux. See Luminary, Illuminate. Source: Websters Dictionary (01 Mar 1998) |
| luminous flux | The quantity of light emitted from a point source in a given time; its unit is the lumen. (05 Mar 2000) |
| luminous intensity | The luminous flux per unit solid angle in a given direction. Synonym: candle-power, radiant intensity. (05 Mar 2000) |
| luminous retinoscope | <instrument> A portable optical device providing either a circular or linear (streak) beam of light. (05 Mar 2000) |
| lumirhodopsin | <protein> Altered form of rhodopsin produced as a result of illumination. (18 Nov 1997) |
| lumisome | <cell biology> SuB-cellular membrane enclosed vesicle that is the site of bioluminescence in some marine coelenterates. Origin: Gr. Soma = body (18 Nov 1997) |
| lumisterol | 1. A by-product in ergocalciferol biosynthesis. 2. A phosphorylated derivative of ribulose that is an intermediate in the pentose monophosphate shunt. (05 Mar 2000) |
| lump | Any kind of abnormal mass in the breast or elsewhere in the body. (09 Oct 1997) |
| lumpectomy | <procedure, surgery> An operation to remove a lump, usually from the body or the breast. (16 Dec 1997) |
| lumper | <zoology> The European eelpout. Synonym: lumpen. Origin: Cf. Lamper eel. Source: Websters Dictionary (01 Mar 1998) |
| lumpfish | <zoology> A large, thick, clumsy, marine fish (Cyclopterus lumpus) of Europe and America. The colour is usually translucent sea green, sometimes purplish. It has a dorsal row of spiny tubercles, and three rows on each side, but has no scales. The ventral fins unite and form a ventral sucker for adhesion to stones and seaweeds. Synonym: lumpsucker, cock-paddle, sea owl. Origin: From Lump, on account of its bulkiness: cf. G. & D. Lump, F. Lompe. Source: Websters Dictionary (01 Mar 1998) |
| lumpsucker | <zoology> The lumprish. Source: Websters Dictionary (01 Mar 1998) |