fin meaning and definition

FIN noun

Definition of fin (noun)

1. the cardinal number that is the sum of four and one
   • synonyms: 5, cinque, five, fivesome, Little Phoebe, pentad, Phoebe, quint, quintet, quintuplet, V
2. one of a pair of decorations projecting above the rear fenders of an automobile
   • synonyms: tail fin, tailfin
3. one of a set of parallel slats in a door or window to admit air and reject rain
   • synonyms: louver, louvre
4. a shoe for swimming; the paddle-like front is an aid in swimming (especially underwater)
   • synonyms: flipper
5. a stabilizer on a ship that resembles the fin of a fish
6. organ of locomotion and balance in fishes and some other aquatic animals

FIN verb

Definition of fin (verb)

1. equip (a car) with fins
2. propel oneself through the water in a finning motion
3. show the fins above the water while swimming
   • "The sharks were finning near the surface"
   • synonyms: break water