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penumbra	1. An incomplete or partial shadow. 2. <astronomy> 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. The faint shade surrounding the dark central portion of a solar spot is also called the penumbra, and sometimes umbra. 3. The part of a picture where the shade imperceptibly blends with the light. Origin: NL, fr. L. Paene almost + umbra shade. Source: Websters Dictionary (01 Mar 1998)

penumbra

1. An incomplete or partial shadow.
2. <astronomy> 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.
The faint shade surrounding the dark central portion of a solar spot is also called the penumbra, and sometimes umbra.
3. The part of a picture where the shade imperceptibly blends with the light.
Origin: NL, fr. L. Paene almost + umbra shade.
Source: Websters Dictionary
(01 Mar 1998)