aphtha

noun
aph·​tha | \ˈaf-thə, ˈap-thə \
variants: also aptha \ ˈap-​ \
plural aphthae also apthae\ -​ˌthē \

Medical Definition of aphtha 

1 : a speck, flake, or blister on the mucous membranes (as in the mouth or gastrointestinal tract or on the lips) characteristic of some diseases (as thrush)

2 : one of the vesicles filled with clear serous fluid that occur in the mouth, on the udder, and in the spaces between the digits of cloven-footed animals in some diseases usually used in plural

3 : a disease (as foot-and-mouth disease) characterized by aphthae

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