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Meaning of lumen

lu•men

Pronunciation: (l'mun), [key]
— 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. Abbr.: lm
  2. the canal, duct, or cavity of a tubular organ.
  3. (of a cell) the cavity that the cell walls enclose.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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