lumen
English Thesaurus
1. a cavity or passage in a tubular organ (noun.body)
| hypernym | : | bodily cavity, cavity, cavum, |
| definition | : | (anatomy) a natural hollow or sinus within the body (noun.body) |
2. 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 (noun.quantity)
| hypernym | : | luminous flux unit, |
| definition | : | a measure of luminous flux per unit area (noun.quantity) |
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