Meaning of lumen in English

1. Pronunciation

   /ˈlumən/

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1. Noun

   lumen

   Etymology

   late 19th century: from Latin, literally ‘light’

   Definitions

   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. 2. a cavity or passage in a tubular organ

   Examples

   • « the lumen of the intestine »