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lumen

PRIMARY MEANINGS OF: lumen

1
 n
a cavity or passage in a tubular organ
2
 n
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
FULL DEFINITIONS OF: lumen
1

n a cavity or passage in a tubular organ

“the lumen of the intestine”
Type of:
bodily cavity, cavity, cavum
(anatomy) a natural hollow or sinus within the body
2

n 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
Type of:
luminous flux unit
a measure of luminous flux per unit area
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