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| um·bra [ úmbrə ] (plural um·bras or um·brae [ úmbree ]) |
noun |
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| Definition: |
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1. physics complete shadow: an area of complete shadow caused by light from all points of a source being prevented from reaching the area, usually by an opaque object
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2. astronomy darkest part on moon or Earth: the darkest portion of the shadow cast by an astronomical object during an eclipse, especially that cast on Earth during a solar eclipse
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3. astronomy dark part of sunspot: the inner, darker area of a sunspot
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| [Late 16th century. < Latin, "shadow"] |
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 um·bral adjective |
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