What is the meaning of lumen?

noun

  • 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.
    • synonyms: lm
  • A cavity or passage in a tubular organ.
    • usage: "the lumen of the intestine"
WordNet 3.0 © 2006 by Princeton University
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APAWordNet. (2010). lumen. Retrieved September 20, 2026, from http://smartdefine.org/lumen/definitions/1212126
ChicagoWordNet. 2010. "lumen" http://smartdefine.org/lumen/definitions/1212126 (accessed September 20, 2026).
HarvardWordNet 2010, lumen, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/lumen/definitions/1212126>.
MLAWordNet. "lumen" 23 October 2010. Web. 20 September 2026. <http://smartdefine.org/lumen/definitions/1212126>
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