Inflected forms: pl. lu·mens or lu·mi·na (-m-n) 1.Anatomy The inner open space or cavity of a tubular organ, as of a blood vessel or an intestine. 2.abbr.lmPhysics The unit of luminous flux in the International System, equal to the amount of light given out through a solid angle by a source of one candela intensity radiating equally in all directions. See table at measurement. 3.Botany The cavity bounded by a plant cell wall.
ETYMOLOGY:
Latin lmen, an opening, light. See leuk- in Appendix I.
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men, an opening, light. See leuk- in Appendix I.
