Penumbra

Definition of Penumbra

Pe`num´bra

n.	1.	An incomplete or partial shadow.
	2.	(Astron.) 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.	(Paint.) The part of a picture where the shade imperceptibly blends with the light.

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