aphthic
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aphthic — aph·thic … English syllables
aphtha — n. (pl. ae ) small white spot or small ulceration on mucous membrane, etc. in humans or animals; disease associated with aphthae, such as thrush. ♦ aphthic, a. ♦ aphthous, a., pertaining to aphtha; ♦ aphthous fever, foot and mouth… … Dictionary of difficult words