Definition of umbra:
- 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.
- The central dark portion, or nucleus, of a sun spot.
- 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.
- The fainter part of a sun spot; - now more commonly called penumbra.
- "Julian Home", Dean Frederic W. Farrar.
- "The Astronomy of Milton's 'Paradise Lost'", Thomas Orchard.
- "The Roman Poets of the Augustan Age: Virgil", W. Y. Sellar.