Synonyms for lumen

Noun

1. lumen, lm, luminous flux unit

usage: 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. lumen, cavity, bodily cavity, cavum

usage: a cavity or passage in a tubular organ; "the lumen of the intestine"