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Meaning of LUMEN

Pronunciation:  'loomun

WordNet Dictionary
  1. [n]  a cavity or passage in a tubular organ; "the lumen of the intestine"
  2. [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

LUMEN is a 5 letter word that starts with L.


 Synonyms: lm
 See Also: bodily cavity, cavity, cavum, luminous flux unit



Webster's 1913 Dictionary
\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.

2. (Biol.) An opening, space, or cavity, esp. a tubular
   cavity; a vacuole.

Medical Dictionary
 Definition: the hollow area within a tube.
Biology Dictionary
 Definition: The space enclosed by a tube structure or hollow organ, such as inside an artery, vein, or the small or large intestines.
Thesaurus Terms
 Related Terms: ASA scale, bougie decimale, British candle, candle, candle lumen, candle power, candle-foot, candle-hour, candle-meter, decimal candle, exposure meter, flux, foot-candle, Hefner 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, Scheiner scale, unit of flux, unit of light