umbra noun - Definition, pictures, pronunciation and usage notes | Oxford Advanced American Dictionary at OxfordLearnersDictionaries.com

Definition of umbra noun from the Oxford Advanced American Dictionary

umbra

noun

NAmE//ˈʌmbrə//

(pl. umbras or umbrae

NAmE//ˈʌmbri//

) (technology)

1the darkest part of a shadow

Definitions on the go

Look up any word in the dictionary offline, anytime, anywhere with the Oxford Advanced Learner’s Dictionary app.

2the area on the earth or the moon that is the darkest during an eclipse compare penumbra

See umbra in the Oxford Advanced Learner's Dictionary

Check pronunciation: umbra