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definition of the word lumen

by the Wiktionnary

Wikipedia has an article on:
Lumen

Wikipedia

Singular
lumen

Plural
lumens or lumina

lumen (plural lumens or lumina)

  1. (physics) In the International System of Units, the derived unit of luminous flux; the amount of light that falls on a unit area at unit distance from a source of one candela. Symbol: lm.
  2. (anatomy) The cavity or channel within a tube or tubular organ.
  3. (botany) The cavity bounded by a plant cell wall.
  4. The bore of a tube such as a hollow needle or catheter.

Definition from Wiktionary
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