umbra
noun /ˈʌmbrə/
/ˈʌmbrə/
(plural umbras, umbrae
(specialist) /ˈʌmbriː/
/ˈʌmbriː/
)- the darkest part of a shadow
- 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’.