noun
- A blister on the mucous membranes of the lips or mouth or gastrointestinal tract. .
WordNet 3.0 © 2006 by Princeton University
| APA | WordNet. (2010). aphthous ulcer. Retrieved September 22, 2026, from http://smartdefine.org/aphthous_ulcer/definitions/1245962 |
| Chicago | WordNet. 2010. "aphthous ulcer" http://smartdefine.org/aphthous_ulcer/definitions/1245962 (accessed September 22, 2026). |
| Harvard | WordNet 2010, aphthous ulcer, Smart Define, viewed 22 September, 2026, <http://smartdefine.org/aphthous_ulcer/definitions/1245962>. |
| MLA | WordNet. "aphthous ulcer" 23 October 2010. Web. 22 September 2026. <http://smartdefine.org/aphthous_ulcer/definitions/1245962> |