fin

The definition of a fin is a wing-like limb attached to many animals living in water, used for swimming and balance.

(noun)

An example of a fin is what fish use for swimming in the water.
An example of a fin is what sticks out of the water when a shark is near the surface.

Fin is a French term meaning the end or finish.

(noun)

An example of fin is the end of a French movie.

See fin in Webster's New World College Dictionary

noun

any of several winglike, membranous organs on the body of a fish, dolphin, etc., used in swimming, turning, and balancing
anything like a fin in shape or use; specif.,
1. any narrow edge or ridge formed in manufacturing, as on a casting by metal forced through the halves of the mold
2. any vertical airfoil, fixed or movable, whose chief function is to give stability in flight
3. a stabilizing or steering projection on boats or submarines
4. Slang a hand or arm

Origin: ME < OE finn, akin to Du vin, Ger finne < IE *(s)pina-, point < base *(s)p(h)ei-, pointed stick > spit, spike

transitive verb finned, finning

to cut the fins from (a fish)

intransitive verb

to move the fins, esp. in a violent way

☆

noun

Slang a five-dollar bill

Origin: shortened < W Yiddish finef, five (cf. E Yiddish finf) < MHG vinf < OHG fimf, five

noun

the end; finish; conclusion

Origin: Fr

See fin in American Heritage Dictionary 4

noun

A membranous appendage extending from the body of a fish or other aquatic animal, used for propelling, steering, or balancing the body in the water.
Something resembling a fin in shape or function, as:
a. A fixed or movable airfoil used to stabilize an aircraft, missile, or projectile in flight.
b. A thin, usually curved projection attached to the rear bottom of a surfboard for stability.
c. A projecting vane used for cooling, as on a radiator or an engine cylinder.
d. See tail fin.
See flipper.