Penumbra
PENUM'BRA, noun [Latin 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.
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PENUM'BRA, noun [Latin 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.