Meaning of “flipper” in the English Dictionary

"flipper" in American English

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flippernoun [ C ]

us /ˈflɪp·ər/

a part similar to an arm used for swimming by any of various sea animals, such as seals and penguins

A flipper is also a long, wide rubber shoe used for swimming.

(Definition of “flipper” from the Cambridge Academic Content Dictionary © Cambridge University Press)