from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A small, painful ulcer or sore, usually of the mouth.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An ulcer in the mouth, called an aphthous ulcer, caused by a break in the mucous membrane.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. an ulceration (especially of the lips or lining of the mouth)
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