Usually means: Painful sore inside the mouth.
Definitions Related words Mentions
We found 6 dictionaries that define the word mouth ulcer:

General (5 matching dictionaries)
  1. mouth ulcer: Longman Dictionary of Contemporary English
  2. mouth ulcer: Merriam-Webster
  3. mouth ulcer: Collins English Dictionary
  4. mouth ulcer: Wiktionary
  5. Mouth ulcer: Wikipedia, the Free Encyclopedia

Medicine (1 matching dictionary)
  1. mouth ulcer: Medical dictionary

Definitions from Wiktionary (mouth ulcer)

noun:  An aphthous ulcer; an open sore in the mouth, or rarely a break in the mucous membrane or the epithelium on the lips or surrounding the mouth.

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