aphthous ulcer

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Noun1.aphthous ulcer - a blister on the mucous membranes of the lips or mouth or gastrointestinal tractaphthous ulcer - a blister on the mucous membranes of the lips or mouth or gastrointestinal tract
ulcer, ulceration - a circumscribed inflammatory and often suppurating lesion on the skin or an internal mucous surface resulting in necrosis of tissue