(n.pl.) An order of birds, including only the penguins, in which the wings are without quills, and not suited for flight.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). impennes. Retrieved September 26, 2026, from http://smartdefine.org/impennes/definitions/2019490 |
| Chicago | Webster's. 2011. "impennes" http://smartdefine.org/impennes/definitions/2019490 (accessed September 26, 2026). |
| Harvard | Webster's 2011, impennes, Smart Define, viewed 26 September, 2026, <http://smartdefine.org/impennes/definitions/2019490>. |
| MLA | Webster's. "impennes" 27 May 2011. Web. 26 September 2026. <http://smartdefine.org/impennes/definitions/2019490> |