canker sore definition

  • noun:
    • a tiny, painful ulcer or aching, typically of this lips.
    • An ulcer in the lips, called an aphthous ulcer, due to some slack in the mucous membrane layer.
    • an ulceration (especially of this mouth or lining associated with the lips)
    • A small, painful ulcer or sore, typically associated with mouth.
    • An ulcer in the mouth, labeled as an aphthous ulcer, caused by some slack when you look at the mucous membrane.
    • an ulceration (especially of the lips or liner associated with the mouth)

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