lumen

lumen1
[ˈluːmɛn]
(缩略词: lm)
noun
  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
    (物理)流明
语源
  1. late 19th cent.: from Latin, literally light'

lumen2
[ˈluːmən]
(pl. lumina -mɪnə)
  1. (Anatomy)the central cavity of a tubular or other hollow structure in an organism or cell
    (剖)腔
派生
luminal
[ˈluːmɪn(ə)l]
adjective
语源
  1. late 19th cent.: from Latin, literally opening'
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