flipper

1. In marine mammals such as whales (or other secondarily aquatic animals such as sea turtles), a wide, flat limb adapted for swimming.
2. A wide, flat, paddle-like rubber covering for the foot, used in swimming.
3. A flat lever in a pinball machine, triggered by the player to strike the ball and keep it in play.
4. A small flat used to support a larger one.
5. A type of ball bowled by a leg spin bowler, which spins backwards and skids off the pitch with a low bounce.
6. Television remote control, clicker. (US, informal)
7. The hand. (dated, slang)
8. A kind of false tooth, usually temporary.

Plural flippers