Flipper

['flɪpə] or ['flɪpɚ]

(noun.) the flat broad limb of aquatic animals specialized for swimming.

(noun.) a shoe for swimming; the paddle-like front is an aid in swimming (especially underwater).

Checked by Cecily--From WordNet

(n.) A broad flat limb used for swimming, as those of seals, sea turtles, whales, etc.

(n.) The hand.

Checked by Elton

Inputed by Jackson