(n.) A genus of large extinct marine reptiles, having a very long neck, a small head, and paddles for swimming. It lived in the Mesozoic age.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). plesiosaurus. Retrieved September 21, 2026, from http://smartdefine.org/plesiosaurus/definitions/2046457 |
| Chicago | Webster's. 2011. "plesiosaurus" http://smartdefine.org/plesiosaurus/definitions/2046457 (accessed September 21, 2026). |
| Harvard | Webster's 2011, plesiosaurus, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/plesiosaurus/definitions/2046457>. |
| MLA | Webster's. "plesiosaurus" 27 May 2011. Web. 21 September 2026. <http://smartdefine.org/plesiosaurus/definitions/2046457> |