- (n.) A shark of the genus Sphyrna or Zygaena, having the eyes set on projections from the sides of the head, which gives it a hammer shape. The Sphyrna zygaena is found in the North Atlantic. Called also hammer fish, and balance fish.
- (n.) An African fruit bat (Hypsignathus monstrosus); -- so called from its large blunt nozzle.
- (n.) A fresh-water fish; the stone-roller.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). hammerhead. Retrieved September 21, 2026, from http://smartdefine.org/hammerhead/definitions/2014846 |
| Chicago | Webster's. 2011. "hammerhead" http://smartdefine.org/hammerhead/definitions/2014846 (accessed September 21, 2026). |
| Harvard | Webster's 2011, hammerhead, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/hammerhead/definitions/2014846>. |
| MLA | Webster's. "hammerhead" 27 May 2011. Web. 21 September 2026. <http://smartdefine.org/hammerhead/definitions/2014846> |