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Definition of umbra:

  1. 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.
  2. The central dark portion, or nucleus, of a sun spot.
  3. 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.
  4. The fainter part of a sun spot; - now more commonly called penumbra.

Synonyms:

gloom, dusk, penumbra, twilight, shadows, blackness, night, black, gloaming, murk, shadow, shadiness, semidarkness, candlelight, umbrage, light, shade, darkness.

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