Last Updated
：2025/11/22
canker sore
（ plural ）
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An ulcer in the mouth, called an aphthous ulcer, caused by a break in the mucous membrane.
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canker sore
I couldn't enjoy the spicy soup because a canker sore on my inner lip made every bite painful.
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I couldn't enjoy the spicy soup because a canker sore on my inner lip made every bite painful.
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