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1. (n.) penumbra
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.
2. penumbra
the grayish marginal portion of a sunspot.
3. penumbra
a shadowy, indefinite, or marginal area.
Etymology: (1660–70; < NL, = L paen(e) almost +umbra shade)
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| Definition of 'penumbra' |
Princeton's WordNet |
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1. (noun) penumbra
a fringe region of partial shadow around an umbra
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| Definition of 'penumbra' |
Webster Dictionary |
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1. (noun) penumbra
an incomplete or partial shadow
2. (noun) penumbra
the shadow cast, in an eclipse, where the light is partly, but not wholly, cut off by the intervening body; the space of partial illumination between the umbra, or perfect shadow, on all sides, and the full light
3. (noun) penumbra
the part of a picture where the shade imperceptibly blends with the light
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| Definitions of 'penumbra' |
The Nuttall Encyclopedia |
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1. penumbra
the name given to the partial shadow on the rim of the total shadow of an eclipse, also to the margin of the light and shade of a picture.
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Definitions of penumbra 
