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plural lumens or lumina
(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. examples
(anatomy) The cavity or channel within a tube or tubular organ. examples
(botany) The cavity bounded by a plant cell wall. examples
(medicine) The bore of a tube such as a hollow needle or catheter. examples