Lumen Meaning

There are 2 meaning(s) for word Lumen

Meaning 1 : 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

    Synonyms : lm
Meaning 2 : a cavity or passage in a tubular organ

    Example : the lumen of the intestine