canker sore
noun1
An ulcer in the mouth, called an aphthous ulcer, caused by a break in the mucous membrane.
Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.
noun
An ulcer in the mouth, called an aphthous ulcer, caused by a break in the mucous membrane.
Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.
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