umbra
noun/ˈʌmbrə/
/ˈʌmbrə/
(plural umbras, umbrae
(specialist)/ˈʌmbriː/
/ˈʌmbriː/
)- the darkest part of a shadow
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- the area on the earth or the moon that is the darkest during an eclipse compare penumbra
Word Originlate 16th cent. (denoting a phantom or ghost): from Latin, literally ‘shade’.
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umbra