- The definition of a fin is a wing-like limb attached to many animals living in water, used for swimming and balance.
- 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.
An example of fin is the end of a French movie.
fin definition by Webster's New World
- 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.,
- any narrow edge or ridge formed in manufacturing, as on a casting by metal forced through the halves of the mold
- any vertical airfoil, fixed or movable, whose chief function is to give stability in flight
- a stabilizing or steering projection on boats or submarines
- Slang a hand or arm
Origin: Middle English ; from Old English finn, akin to Dutch vin, German finne ; from Indo-European an unverified form (s)pina-, point ; from base an unverified form (s)p(h)ei-, pointed stick from source spit, spike
Origin: shortened ; from western Yiddish finef, five (cf. eastern; English Yiddish finf) ; from Middle High German vinf ; from Old High German fimf, five
fin definition by American Heritage Dictionary
- 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.
- To emerge with the fins above water.
- To swim, as a fish.
- To lash the water with the fins. Used of a dying whale.
Origin: Middle English, from Old English finn.
fins of a typical bony fish
Origin: Yiddish finf, five, from Old High German funf, finf; see penkwe in Indo-European roots.
fin - Science Definition