Definitions for lumenˈlu mən; -mə nə

This page provides all possible meanings and translations of the word lumen

Random House Webster's College Dictionary

lu•menˈlu mən; -mə nə(n.)(pl.)-mens, -mi•na

  1. the unit of luminous flux, equal to the luminous flux emitted in a unit solid angle by a point source of one candle intensity.

    Category: Optics

    Ref: Abbr.: lm 2

  2. the canal, duct, or cavity of a tubular organ.

    Category: Anatomy

Origin of lumen:

1870–75; < NL; L lūmen, s. lūmin- light, window

Princeton's WordNet

  1. lumen, lm(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

  2. lumen(noun)

    a cavity or passage in a tubular organ

    "the lumen of the intestine"


  1. lumen(Noun)

    In the International System of Units, the derived unit of luminous flux; the amount of light that falls on a unit area at unit distance from a source of one candela. Symbol: lm.

  2. lumen(Noun)

    The cavity or channel within a tube or tubular organ.

  3. lumen(Noun)

    The cavity bounded by a plant cell wall.

  4. lumen(Noun)

    The bore of a tube such as a hollow needle or catheter.


  1. Lumen

    A lumen in biology is the inside space of a tubular structure, such as an artery or intestine. By extension, the term lumen is also used to describe the inside space of a cellular component or structure, such as the endoplasmic reticulum.

Translations for lumen

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