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Penumbra

Definition: An incomplete or partial shadow.

Penumbra

Definition: 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.

Penumbra

Definition: The part of a picture where the shade imperceptibly
blends with the light.