Dictionary Entry
antumbra
nounFind the meaning of the word antumbra, 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 lighter, outer part of a shadow beyond the darkest central part (umbra), where the light source appears as a ring around the object casting the shadow, as seen during an annular eclipse.
Example Sentence
During an annular solar eclipse, observers located in the antumbra witness the sun as a bright ring around the moon.
Usage Note
This term is primarily used in astronomy and optics to describe a specific region of a shadow, particularly in the context of eclipses. It helps distinguish between the darkest part of a shadow (umbra) and the lighter, outer part (penumbra), and the region where the light source is not fully blocked but appears as a ring.
Synonyms
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Antonyms
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