excrescence
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/ɪkˈskresns/
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/ɪkˈskresns/
An abnormal growth or projection, often unattractive or unwanted, that can occur on living organisms or structures.
The old tree had a large excrescence that made it look like it was wearing a hat.
这棵老树有一个大的突起,使它看起来像是在戴帽子。