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Aphthae
Aphthae Aph"th[ae], n. pl. [L., fr. Gr. ? (mostly in pl. ?,
Hipp.) an eruption, thrush, fr. ? to set on fire, inflame.]
(Med.)
Roundish pearl-colored specks or flakes in the mouth, on the
lips, etc., terminating in white sloughs. They are commonly
characteristic of thrush.
Meaning of Aphthae from wikipedia