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canker sore

noun, Pathology
an ulceration of a mucous membrane, especially of the mouth.
Origin of canker sore
1905-10 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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canker-sore in Medicine

canker sore n.
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® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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