• (RP) IPA: /ˈluːmən/
  • (GA) enPR: lo͞oʹmən, IPA: /ˈlumən/

lumen (plural lumens)

  1. (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.
  2. (anatomy) The cavity or channel within a tube or tubular organ.
  3. (botany) The cavity bounded by a plant cell wall.
  4. (medicine) The bore of a tube such as a hollow needle or catheter.
Related terms Translations Translations Translations
  • Russian: по́лость

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