English definition of Penumbra

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Definition of penumbra

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Penumbra (n.) 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..

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Penumbra :: Penumbra (n.) 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..

Penumbrala :: Penumbrala () Of or pertaining to a penumbra; resembling a penumbra; partially illuminated.

Umbra :: Umbra (n.) The conical shadow projected from a planet or satellite, on the side opposite to the sun, within which a spectator could see no portion of the sun's disk; -- used in contradistinction from penumbra. See Penumbra..

Penumbra :: Penumbra (n.) The part of a picture where the shade imperceptibly blends with the light.

Umbra :: Umbra (n.) The fainter part of a sun spot; -- now more commonly called penumbra.

Penumbra :: Penumbra (n.) An incomplete or partial shadow.