| Main Entry: | canker sore |
| Part of Speech: | noun |
| Definition: | mouth ulcer |
Synonyms: |
canker, cold sore, fever blister, herpes labialis, herpes simplex, lesion, oral herpes |
| Notes: | a canker sore is inside the mouth while a cold sore is outside the mouth a cold sore or fever blister is usually caused by herpes simplex; a canker sore is usually due to food allergy or stress |