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Definitions for Lumen

[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. Abbreviation : lm
[2] Anatomy . the canal, duct, or cavity of a tubular organ.
[3] Botany . (of a cell) the cavity that the cell walls enclose.
[4] the derived SI unit of luminous flux; the flux emitted in a solid angle of 1 steradian by a point source having a uniform intensity of 1 candela Symbol: lm
[5] anatomy a passage, duct, or cavity in a tubular organ
[6] a cavity within a plant cell enclosed by the cell walls

Words nearby Lumen

lumbricide, lumbricoid, lumbricosis, lumbricus, lumbus, lumen, lumen-hour, lumholtz's kangaroo, luminaire, luminal, luminance

Origin of Lumen

1870–75; < New Latin, special uses of Latin lūmen (stem lūmin- ) light, window

Other words from Lumen

lu′ men•al null adj.

Word origin for Lumen

C19: New Latin, from Latin: light, aperture