Pronunciation: (flip'ur),[key] —n. 1. a broad, flat limb, as of a seal or whale, especially adapted for swimming.
2. Also calledfin. one of a pair of paddlelike devices, usually of rubber, worn on the feet as an aid in scuba diving and swimming.
3. Theat.a narrow flat hinged or attached at right angles to a larger flat.
4. Slang.the hand.
5. someone or something that flips.