From The Collaborative International Dictionary of English v.0.44 [gcide]:
Lumen \Lu"men\, noun; 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.]
From WordNet (r) 2.0 [wn]:
noun
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 [syn: {lm}]
2: a cavity or passage in a tubular organ; "the lumen of the intestine" [also: {lumina} (pl)]
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
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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