lumen

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Noun lumen has 2 senses

lumen, lm - 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
--₁ is a kind of luminous flux unit
lumen - a cavity or passage in a tubular organ; "the lumen of the intestine"
--₂ is a kind of cavity, bodily cavity, cavum

lumbermill lumberyard lumbosacral lumbosacral plexus lumbricus lumbus lume lumell lumen lumenare lumilash lumimous lumina luminaire luminal luminam luminance

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