Thesaurus: lumen

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1. n. 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
2. n. a cavity or passage in a tubular organ
3. 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. 2. (Biol.) An opening, space, or cavity, esp. a tubular cavity; a vacuole.
4. n:100 n. 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 n. a cavity or passage in a tubular organ