(n.pl.) A division of Mammalia including those that have a placenta or all the orders above the marsupials.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). Placentalia. Retrieved September 22, 2026, from http://smartdefine.org/placentalia/definitions/2045991 |
| Chicago | Webster's. 2011. "Placentalia" http://smartdefine.org/placentalia/definitions/2045991 (accessed September 22, 2026). |
| Harvard | Webster's 2011, Placentalia, Smart Define, viewed 22 September, 2026, <http://smartdefine.org/placentalia/definitions/2045991>. |
| MLA | Webster's. "Placentalia" 27 May 2011. Web. 22 September 2026. <http://smartdefine.org/placentalia/definitions/2045991> |