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penumbra |
2 definitions found From Webster's Revised Unabridged Dictionary (1913) [web1913]: Penumbra \Pe*num"bra\, n. [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 1.6 [wn]: penumbra n : a fringe region of partial shadow around an umbra
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