英语释义
1. a painful shallow ulcer of the mouth that has a grayish-white base surrounded by a reddish inflamed area and is of uncertain cause but is not due to the virus causing herpes simplex — compare cold sore
2. a small painful sore inside the mouth
3. a small painful sore of the mouth
4. a small painful ulcer especially of the mouth especially a painful shallow ulceration of the oral mucous membranes that has a grayish-white base surrounded by a reddish inflamed area and is characteristic of aphthous stomatitis — compare cold sore