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The Collaborative International Dictionary of English v.0.48 (gcide)

Penumbra \Pe*num"bra\, n. [NL., fr. L. paene almost umbra
shade.]
1. An incomplete or partial shadow.
[1913 Webster]

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. --Sir
I. Newton.
[1913 Webster]

Note: The faint shade surrounding the dark central portion of
a solar spot is also called the {penumbra}, and
sometimes {umbra}.
[1913 Webster]

3. (Paint.) The part of a picture where the shade
imperceptibly blends with the light.
[1913 Webster]

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