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1. (n.) lumen
the unit of luminous flux, equal to the luminous flux emitted in a unit solid angle by a point source of one candle intensity.
2. lumen
the canal, duct, or cavity of a tubular organ.
Etymology: (1870–75; < NL; L lūmen, s.
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| Definition of 'LUMEN' |
Princeton's WordNet |
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1. (noun) lumen, lm
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
2. (noun) lumen
a cavity or passage in a tubular organ
"the lumen of the intestine"
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Definitions of LUMEN 
