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aphtha

/ˈæfθə/
noun (pl) -thae (-θiː)
1.
a small ulceration on a mucous membrane, as in thrush, caused by a fungal infection
2.
(vet science) another name for foot-and-mouth disease
Derived Forms
aphthous, adjective
Word Origin
C17: via Latin from Greek: mouth-sore, thrush
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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aphtha in Medicine

aphtha aph·tha (āf'thə)
n. pl. aph·thae (-thē')
A minute painful ulcer on a mucous membrane of the mouth, often covered by a gray or white exudate.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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