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 | ||
Synonyms | lm | ||
Broader (hypernym) | luminous flux unit | ||
2. | lumen (body) a cavity or passage in a tubular organ | ||
Samples | The lumen of the intestine. | ||
Broader (hypernym) | bodily cavity, cavity, cavum | ||