- (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 fainter part of a sun spot; -- now more commonly called penumbra.
- (n.) The central dark portion or nucleus, of a sun spot.
- (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.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). umbra. Retrieved September 23, 2026, from http://smartdefine.org/umbra/definitions/2076127 |
| Chicago | Webster's. 2011. "umbra" http://smartdefine.org/umbra/definitions/2076127 (accessed September 23, 2026). |
| Harvard | Webster's 2011, umbra, Smart Define, viewed 23 September, 2026, <http://smartdefine.org/umbra/definitions/2076127>. |
| MLA | Webster's. "umbra" 28 May 2011. Web. 23 September 2026. <http://smartdefine.org/umbra/definitions/2076127> |