Definition of umbra

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< umbonate

umbrage >

um·bra

(

) KEY

NOUN:
pl. um·bras or um·brae (-br

) KEY

A dark area, especially the blackest part of a shadow from which all light is cut off. See Synonyms at shade.
Astronomy
1. The completely dark portion of the shadow cast by the earth, moon, or other body during an eclipse.
2. The darkest region of a sunspot.

ETYMOLOGY:
Latin, shadow

OTHER FORMS:
umbral (Adjective)

Thesaurus: synonyms for umbra

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The American Heritage® Dictionary of the English Language, Fourth Edition.
Copyright © 2000 by Houghton Mifflin Company.
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