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penumbraPENUM'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. |
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penumbraPENUM'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. |