Dictionary![]() ![]() lu•menPronunciation: (lOO'mun), [key] —n., —pl. -mens, -mi•naPronunciation: (-mu-nu). [key] 1. Optics.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. Anat.the canal, duct, or cavity of a tubular organ. 3. Bot.(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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