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单词 lumen
释义

lumen /looˈ or lūˈmen/

noun (pl luˈmina or luˈmens)
  1. A derived SI unit, the unit of luminous flux (symbol lm), equal to the light emitted in one second in a solid angle of one steradian from a point that is a radiation source of uniform intensity of one candela (abbrev lu)
  2. The cavity of a tubular organ (anatomy)
  3. The space within the cell wall (botany)
ORIGIN: L lūmen, -inis light, from lūcēre to shine

luˈmenal or luˈminal adjective

Of a lumen

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更新时间:2024/12/23 14:27:04