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umbra

noun
🔊/ˈʌmbrə/
🔊/ˈʌmbrə/
(plural umbras, umbrae
🔊/ˈʌmbriː/
🔊/ˈʌmbriː/
)
(specialist)
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  1. the darkest part of a shadow本影（影子中光源完全照射不到的部分）
  2. the area on the earth or the moon that is the darkest during an eclipse （日食或月食期间地球或月球的）本影compare penumbra
    3. Word Originlate 16th cent. (denoting a phantom or ghost): from Latin, literally ‘shade’.