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[pi-nuhm-bruh] /pɪˈnʌm brə/

noun, plural penumbrae
[pi-nuhm-bree] /pɪˈnʌm bri/ (Show IPA), penumbras.

a shadowy, indefinite, or marginal area.
noun (pl) -brae (-briː), -bras
a fringe region of half shadow resulting from the partial obstruction of light by an opaque object
(astronomy) the lighter and outer region of a sunspot
(painting) the point or area in which light and shade blend

1660s, from Modern Latin penumbra “partial shadow outside the complete shadow of an eclipse,” coined 1604 by Kepler from Latin pæne “almost” + umbra “shadow” (see umbrage). Related: Penumbral.
Plural penumbras or penumbrae (pĭ-nŭm’brē)


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