Definitions For Fin

noun

• Organ of locomotion and balance in fishes and some other aquatic animals
• A stabilizer on a ship that resembles the fin of a fish
• A shoe for swimming; the paddle-like front is an aid in swimming (especially underwater)
• One of a set of parallel slats in a door or window to admit air and reject rain
• One of a pair of decorations projecting above the rear fenders of an automobile
• The cardinal number that is the sum of four and one

verb

• Show the fins above the water while swimming
• Propel oneself through the water in a finning motion
• Equip (a car) with fins