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penumbra

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

Penumbra \Pe*num"bra\, noun [NL., fr. L. paene almost + umbra shade.]

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. --Sir I. Newton.

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

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

From WordNet (r) 3.0 (2006) [wn]:

penumbra

noun

1: a fringe region of partial shadow around an umbra


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Monday, March 2, 2015 11:10:40 PM Coordinated Universal Time (UTC)

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