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5 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 lu·men /ˈlumən/

From: DICT.TW English-Chinese Medical Dictionary 英漢醫學字典

 lu·men /ˈlumən/ 名詞

From: Taiwan MOE computer dictionary


From: Webster's Revised Unabridged Dictionary (1913)

 Lu·men n.; pl. L. Lumina E. Lumens .
 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.

From: WordNet (r) 2.0

      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 [syn: lm]
      2: a cavity or passage in a tubular organ; "the lumen of the
      [also: lumina (pl)]