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首頁英語詞典lumenlumen英英釋意

lumen

英 ['lu?men] 美['lum?n]
  • n. 流明（光束的能量單位）；（管狀器官內(nèi)的）內(nèi)腔

英英釋意

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"