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penumbras Definition

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penumbras
noun(pen-um-bra)
a space of partial illumination (as in an eclipse) between the perfect shadow on all sides and the full light
penumbras
noun(pen-um-bra)
a shaded region surrounding the dark central portion of a sunspot
penumbras
noun(pen-um-bra)
a surrounding or adjoining region in which something exists in a lesser degree : fringe

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