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lumen 音标拼音: [l'umən] n. 流明,内腔 流明,内腔 lumen流明 lumen n 1: a unit of luminous flux equal to the amount of light given out through a solid angle of 1 steradian by a point source of 1 candela intensity radiating uniformly in all directions [ synonym: { lumen}, { lm}] 2: a cavity or passage in a tubular organ; " the lumen of the intestine" Lumen \ Lu" men\, n.; pl. L. { Lumina}, E. { Lumens}. [ L., light, an opening for light.] 1. ( Photom.) ( a) A unit of illumination, being the amount of illumination of a unit area of spherical surface, due to a light of unit intensity placed at the center of the sphere. ( b) A unit of light flux, being the flux through one square meter of surface the illumination of which is uniform and of unit brightness. [ Webster 1913 Suppl.] 2. ( Biol.) An opening, space, or cavity, esp. a tubular cavity; a vacuole. [ Webster 1913 Suppl.] 32 Moby Thesaurus words for " lumen": ASA scale, British candle, Hefner candle, Scheiner scale, bougie decimale, candle, candle lumen, candle power, candle- foot, candle- hour, candle- meter, decimal candle, exposure meter, flux, foot- candle, intensity, international candle, lamp- hour, light, light meter, light quantum, lumen meter, lumen- hour, lumeter, luminous flux, luminous intensity, luminous power, lux, photon, quantum, unit of flux, unit of light
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