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English noun: lumen

1. lumen (quantity) 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


Synonymslm


Broader (hypernym)luminous flux unit

2. lumen (body) a cavity or passage in a tubular organ


SamplesThe lumen of the intestine.


Broader (hypernym)bodily cavity, cavity, cavum









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