| Definitions | | lumen |
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noun (pl=lumens, pl2=lumina)
- (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
- (anatomy) The cavity or channel within a tube or tubular organ.
- (botany) The cavity bounded by a plant cell wall.
- The bore of a tube such as a hollow needle or catheter.
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