five, 5, V, cinque, quint, quintet, fivesome, quintuplet, pentad, fin, Phoebe, Little Phoebe (noun)

the cardinal number that is the sum of four and one

tail fin, tailfin, fin (noun)

one of a pair of decorations projecting above the rear fenders of an automobile

louver, louvre, fin (noun)

one of a set of parallel slats in a door or window to admit air and reject rain

flipper, fin (noun)

a shoe for swimming; the paddle-like front is an aid in swimming (especially underwater)

fin (noun)

a stabilizer on a ship that resembles the fin of a fish

fin (verb)

organ of locomotion and balance in fishes and some other aquatic animals

fin (verb)

equip (a car) with fins

fin (verb)

propel oneself through the water in a finning motion

fin, break water (verb)

show the fins above the water while swimming

"The sharks were finning near the surface"

Fin (ProperNoun)

commune in the Somme department in France

Fin

A fin is a thin component or appendage attached to a larger body or structure. Fins typically function as foils that produce lift or thrust, or provide the ability to steer or stabilize motion while traveling in water, air, or other fluid media. Fins are also used to increase surface areas for heat transfer purposes, or simply as ornamentation. Fins first evolved on fish as a means of locomotion. Fish fins are used to generate thrust and control the subsequent motion. Fish, and other aquatic animals such as cetaceans, actively propel and steer themselves with pectoral and tail fins. As they swim, they use other fins, such as dorsal and anal fins to achieve stability and refine their maneuvering.