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Noah Webster's 1828 American Dictionary
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P  ›  penumbra
P  ›  penumbra
1828 Definition

PENUM'BRA, n. [L.pene, almost,and umbra,shade.] In astronomy, a partial shade or obscurity on the margin of the perfect shade in an eclipse, or between the perfect shade, where the light is entirely intercepted,and the full light.

1913 Definition
Penumbra (penumbra)
n.(?)
Pe*num"bra
[NL., fr. L. paene almost + umbra shade.]
  1. An incomplete or partial shadow.
  2. 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.

    * 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.

1828 dictionary
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