Lumen

3 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  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.]

From WordNet (r) 2.0 [wn]:

  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 [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