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Definition of Umbra
- noun The conical shadow projected from a planet or satellite, on the side opposite to the sun, within which a spectator could see no portion of the sun's disk; -- used in contradistinction from penumbra. See Penumbra.
- noun The central dark portion, or nucleus, of a sun spot.
- noun The fainter part of a sun spot; -- now more commonly called penumbra.
- noun Any one of several species of sciaenoid food fishes of the genus Umbrina, especially the Mediterranean species (U. cirrhosa