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canker sore

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noun Pathology.
  1. an ulceration of a mucous membrane, especially of the mouth.

Origin of canker sore

First recorded in 1905–10
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
canker sore in Medicine

canker sore

n.
  1. A small painful ulcer of the mucous membrane of the mouth; an aphtha.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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