| 单词 | lumen |
| 释义 | lumen /looh"meuhn/, n. , pl. lumens, lumina /-meuh neuh/. 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. [1870-75; < NL, special uses of L lumen (s. lumin-) light, window] |
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