a thin flat membrane of the body of many sea creatures, used for swimming and keeping balance
a shoe for swimming; the paddle-like front is an aid in swimming (especially underwater)
the cardinal number that is the sum of four and one
a stabilizer on a ship that resembles the fin of a fish
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
show the fins above the water while swimming
propel oneself through the water in a finning motion
equip (a car) with fins