The Collaborative International Dictionary
Aphthous
Aphthous \Aph"thous\a. [Cf. F. aphtheux.] Pertaining to, or caused by, aphth[ae]; characterized by apht[ae]; as, aphthous ulcers; aphthous fever.
Wiktionary
aphthous
a. of, or relating to aphtha
WordNet
Wikipedia
Usage examples of "aphthous".
As a wash it is good for spongy gums, ulcerated throat and aphthous stomatitis, and the tincture is also applied to foul and indolentulcers.