lumen
英 ['luːmen]
美['lumɛn]
- n. 流明（光束的能量单位）；（管状器官内的）内腔
英英释意
- 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
- 2. a cavity or passage in a tubular organ;
- "the lumen of the intestine"