English version

mouth ulcer

From Longman Dictionary of Contemporary Englishmouth ulcerˈmouth ˌulcer British English, canker sore American English noun [countable]  a sore area in the mouth of people or animals, caused by illness or a disease
Examples from the Corpus
mouth ulcerSharp teeth can cause terrible ulcers and anyone who has had a mouth ulcer himself will know what agony they can be.
Pictures of the day
Do you know what each of these is called?
Click on the pictures to check.
Word of the day luck out to be lucky