aphthous
/ˈæfθəs/
adjective
- Relating to or characterized by small, painful ulcers (sores) in the mouth, commonly known as canker sores.
- She developed an aphthous ulcer on the inside of her cheek after eating too much citrus.
- The dentist diagnosed the painful white patches as aphthous stomatitis.
- Stress and certain foods can trigger aphthous outbreaks in some people.