ˈmouth ˌulcer BrE AmE British English , canker sore American English noun [countable]
a sore area in the mouth of people or animals, caused by illness or a disease
ˈmouth ˌulcer BrE AmE British English , canker sore American English noun [countable]
a sore area in the mouth of people or animals, caused by illness or a disease
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012