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单词 penumbra
释义

penumbra

​noun countable
UK /pəˈnʌmbrə/
Word Forms
singularpenumbra
pluralpenumbras
DEFINITIONS1
  1. 1
    an area covered by the outer part of a shadow, so that it is not completely dark
    Synonyms and related words
    The outer parts of objects or spaces
    apex
    back
    back end

penumbra

​noun countable ​physics
US /pəˈnʌmbrə/
Word Forms
singularpenumbra
pluralpenumbras
DEFINITIONS1
  1. 1
    an area covered by the outer part of a shadow, so that it is not completely dark
    Synonyms and related words
    The outer parts of objects or spaces
    apex
    back
    back end
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更新时间：2026/9/30 5:58:52