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Dictionary Entry

umbra

noun

Find the meaning of the word umbra, plus dictionary definition, pronunciation, thesaurus-style synonyms, antonyms, and related vocabulary.

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Meaning

Dictionary meaning in a clear, student-friendly format.

The darkest part of a shadow, especially the cone-shaped region of complete shadow cast by an opaque body, such as the moon or Earth, during an eclipse.

Example Sentence

During a total solar eclipse, only those within the umbra will witness the sun's corona.

Usage Note

The term "umbra" is primarily used in astronomy to describe the darkest, most central part of a shadow, particularly in the context of eclipses. For a general audience, it helps to explain that it's where the light source is completely blocked. It can also be used metaphorically to describe a deep, enveloping darkness or obscurity.