Meaning Of The Word Penumbra

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Penumbra Meaning

Penumbra Definition
Penumbra Definition

What's The Definition Of Penumbra?

penumbra
countable noun: A penumbra is an area of light shadow.

penumbra in American English
the partly lighted area surrounding the complete shadow (umbra) of a body, as the moon, during an eclipse
noun: the partial or imperfect shadow outside the complete shadow of an opaque body, as a planet, where the light from the source of illumination is only partly cut off

penumbra in British English
noun: a fringe region of half shadow resulting from the partial obstruction of light by an opaque object

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