World English Dictionary
aphtha (ˈæfθə)
n , pl -thae
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
[C17: via Latin from Greek: mouth-sore, thrush]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

aphthous aph·thous (āf'thəs)
Of or relating to aphthae or aphthosis.

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