Толковый словарь английского языка - lumen
Lumen
lumen
noun (plural ~s; also lumina) Etymology: New Latin lumin-, ~, from Latin, light, air shaft, opening Date: 1873 the cavity of a tubular organ or part , the bore of a tube (as of a hollow needle or catheter), a unit of luminous flux equal to the light emitted in a unit solid angle by a uniform point source of one candle intensity, luminal also ~al adjective
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1.
n. 1 Physics the SI unit of luminous flux, equal to the amount of light emitted per second in a unit solid angle of one steradian from a uniform source of one candela. Usage Abbr.: lm. 2 Anat. (pl. lumina) a cavity within a tube, cell, etc. Derivatives luminal adj. Etymology: L lumen luminis a light, an opening ...Толковый словарь английского языка Oxford English Reference
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