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lumen

 
Noun lumen has 2 senses
  1. 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
  2. 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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