lumen

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 (synset 113662778)
    is a type of: luminous flux unit - a measure of luminous flux per unit area
    same as: lm
  2. A cavity or passage in a tubular organ (synset 105261541)
    "the lumen of the intestine"
    is a type of: bodily cavity, cavity, cavum - (anatomy) a natural hollow or sinus within the body

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