| 单词 | lumen |
| 释义 | Word Frequency lumen(ˈluːmɪn) nounWord forms: plural -mens or -mina (-mɪnə) 1. 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: lm2. anatomy a passage, duct, or cavity in a tubular organ 3. a cavity within a plant cell enclosed by the cell walls Derived forms lumenal (ˈlumenal) or luminal (ˈluminal) adjective Word origin C19: New Latin, from Latin: light, aperture |
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