flipper

flip|per /fl'ɪpər/ (flippers)
1 [N-COUNT] usu pl
Flippers are flat pieces of rubber that you can wear on your feet to help you swim more quickly, especially underwater.
2 [N-COUNT] usu pl
The flippers of an animal that lives in water, for example a seal or a penguin, are the two or four flat limbs which it uses for swimming.

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