1. The flat broad limb of aquatic animals specialized for swimming
   "The seal's flippers propelled it swiftly through the water"
    
2. A shoe for swimming; the paddle-like front is an aid in swimming (especially underwater)
   "The scuba diver put on his flippers before entering the water";
   - fin

Derived forms: flippers

Type of: limb, shoe

Part of: aquatic mammal, aquatic vertebrate

Encyclopedia: Flipper, Henry