tail fin

noun

caudal fin.

Automotive. See under fin¹(def 7).

Origin of tail fin

First recorded in 1675–85

fin

[ fin ]

/ fɪn /

noun

a membranous, winglike or paddlelike organ attached to any of various parts of the body of fishes and certain other aquatic animals, used for propulsion, steering, or balancing.

Nautical.

a horizontal, often adjustable, winglike appendage to the underwater portion of a hull, as one for controlling the dive of a submarine or for damping the roll of a surface vessel.
fin keel.

Also called vertical stabilizer. Aeronautics. any of certain small, subsidiary structures on an aircraft, designed to increase directional stability.

any of a number of standing ridges on an ordinarily hot object, as a radiator, a cylinder of an internal-combustion engine, etc., intended to maximize heat transfer to the surrounding air by exposing a large surface area.

any part, as of a mechanism, resembling a fin.

Metallurgy. a ridge of metal squeezed through the opening between two rolls, dies, or halves of a mold in which a piece is being formed under pressure.Compare flash(def 11).

Automotive. an ornamental structure resembling an aeronautical fin that is attached to the body of an automobile, as on each rear fender (tail fin).

Slang. the arm or hand.

Usually fins. flipper(def 2).

verb (used with object), finned, fin·ning.

to cut off the fins from (a fish); carve or cut up, as a chub.

to provide or equip with a fin or fins.

verb (used without object), finned, fin·ning.

to move the fins; lash the water with the fins, as a whale when dying.

Origin of fin

before 1000; Middle English, Old English finn; cognate with Dutch vin, Low German finne; akin to Swedish fena

Related formsfin·less, adjectivefin·like, adjective

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for tail fin

The tail-fin, which is deepest at mid-length, extends to the back of the head and is flecked with brown.
The Amphibians and Reptiles of Michoacn, Mxico|William E. Duellman
In small larvae the outer edge of the tail-fin is dark brown.
The Amphibians and Reptiles of Michoacn, Mxico|William E. Duellman
The tail shortens and finally disappears in the frogs and toads; with the salamanders the tail-fin only is lost.
Elementary Zoology, Second Edition|Vernon L. Kellogg
The reader will see from the figure that the tail-fin is very large, and the backbone appears to run into the lower lobe.
Extinct Monsters|H. N. Hutchinson

She is said to have a hand as large as the tail-fin of a whale, and if she strikes you with it there is an end of you.
Eskimo Life|Fridtjof Nansen

British Dictionary definitions for tail fin

Fin

abbreviation for

Finland

Finnish

FIN

abbreviation for

Finland (international car registration)

fin

/ (fɪn) /

noun

any of the firm appendages that are the organs of locomotion and balance in fishes and some other aquatic animals. Most fishes have paired and unpaired fins, the former corresponding to the limbs of higher vertebrates

a part or appendage that resembles a fin

British a vertical surface to which the rudder is attached, usually placed at the rear of an aeroplane to give stability about the vertical axisUS name: vertical stabilizer
a tail surface fixed to a rocket or missile to give stability

nautical a fixed or adjustable blade projecting under water from the hull of a vessel to give it stability or control

a projecting rib to dissipate heat from the surface of an engine cylinder, motor casing, or radiator

(often plural) another name for flipper (def. 2)

verb fins, finning or finned

(tr) to provide with fins

(tr) to remove the fins from (a dead fish)

(intr) (esp of a whale) to agitate the fins violently in the water

Derived Formsfinless, adjective

Word Origin for fin

Old English finn; related to Middle Dutch vinne, Old Swedish fina, Latin pinna wing

fin

/ (fɪn) /

noun

US slang a five-dollar bill

Word Origin for fin

from Yiddish finf five, ultimately from Old High German funf, finf

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for tail fin

fin

Old English finn, from Proto-Germanic *finno (cf. Middle Low German vinne, Dutch vin), perhaps from Latin pinna "feather, wing" (see pin (n.)); or, less likely, from Latin spina "thorn, spine" (see spike (n.1)).

U.S. underworld slang sense of "$5 bill" is 1925, from Yiddish finif "five," from German fünf (see five) and thus unrelated. The same word had been used in England 1868 to mean "five pound note" (earlier finnip, 1839).

Science definitions for tail fin