canker sore

canker sore definition - medical

canker sore

noun
A small painful ulcer of the mucous membrane of the mouth; an aphtha. Also called aphthous stomatitis, recurrent aphthous ulcers, ulcerative stomatitis.

The American Heritage® Medical Dictionary Copyright © 2009 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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