Definitions from Wiktionary (lumen)

▸ noun:  (physics) In the International System of Units, the derived unit of luminous flux; the light that is emitted in a solid angle of one steradian from a source of one candela. Symbol: lm.
▸ noun:  (anatomy) The cavity or channel within a tube or tubular organ.
▸ noun:  (botany) The cavity bounded by a plant cell wall.
▸ noun:  (medicine) The bore of a tube such as a hollow needle or catheter.
▸ Also see lumen

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