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Definition of Lumen
Noun: lumen (lumens,lumina) loo-mun
- 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
- A cavity or passage in a tubular organ
"the lumen of the intestine"
Anagrams containing the word lumen