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canker sore

noun, Pathology
1.
an ulceration of a mucous membrane, especially of the mouth.
Origin
1905-1910
1905-10
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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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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Encyclopedia Article for canker sore

aphthous stomatitis

a small, painful ulcer of the oral cavity. Canker sores are round, shallow, white ulcers on the inner surface of the cheek or lip. They are surrounded by an inflamed area and may reach 2.5 cm (1 inch) in size. Canker sores can occur in three forms: as one to five small lesions that heal within two weeks; as relatively large ulcers exceeding 6 mm (14 inch) in diameter and persisting up to three months, leaving a scar; and as many small, superficial ulcers that appear simultaneously. The most severe cases may interfere with eating and speech.

Learn more about aphthous stomatitis with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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