Lumen
WordNet

noun


(1)   A cavity or passage in a tubular organ
"The lumen of the intestine"
(2)   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
WiktionaryText

Noun



  1. In the International System of Units, the derived unit of luminous flux; the amount of light that falls on a unit area at unit distance from a source of one candela. Symbol: lm.
  2. The cavity or channel within a tube or tubular organ.
  3. The cavity bounded by a plant cell wall.
  4. The bore of a tube such as a hollow needle or catheter.
 
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