(n.pl.) An order of marine mammals, including the whales. Like ordinary mammals they breathe by means of lungs, and bring forth living young which they suckle for some time. The anterior limbs are changed to paddles; the tail flukes are horizontal. There are two living suborders:.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). cetacea. Retrieved September 22, 2026, from http://smartdefine.org/cetacea/definitions/1986023 |
| Chicago | Webster's. 2011. "cetacea" http://smartdefine.org/cetacea/definitions/1986023 (accessed September 22, 2026). |
| Harvard | Webster's 2011, cetacea, Smart Define, viewed 22 September, 2026, <http://smartdefine.org/cetacea/definitions/1986023>. |
| MLA | Webster's. "cetacea" 27 May 2011. Web. 22 September 2026. <http://smartdefine.org/cetacea/definitions/1986023> |