Definition of umbra

• n. - 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.
• n. - The central dark portion, or nucleus, of a sun spot.
• n. - The fainter part of a sun spot; -- now more commonly called penumbra.
• n. - Any one of several species of sciaenoid food fishes of the genus Umbrina, especially the Mediterranean species (U. cirrhosa), which is highly esteemed as a market fish; -- called also ombre, and umbrine.