noun
- Drooping of the upper eyelid caused by muscle paralysis and weakness. .
WordNet 3.0 © 2006 by Princeton University
| APA | WordNet. (2010). ptosis. Retrieved September 21, 2026, from http://smartdefine.org/ptosis/definitions/1247327 |
| Chicago | WordNet. 2010. "ptosis" http://smartdefine.org/ptosis/definitions/1247327 (accessed September 21, 2026). |
| Harvard | WordNet 2010, ptosis, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/ptosis/definitions/1247327>. |
| MLA | WordNet. "ptosis" 23 October 2010. Web. 21 September 2026. <http://smartdefine.org/ptosis/definitions/1247327> |