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top: fins of a typical bony fish
bottom: swimming fins

fin 1

1. 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.
2. Something resembling a fin in shape or function, as:
a. A covering for the foot having a flat flexible portion made of rubber or plastic that widens as it extends forward from the toes, used to provide enhanced propulsion in swimming and diving. Also called flipper.
b. A fixed or movable airfoil used to stabilize an aircraft, missile, or projectile in flight.
c. A thin, usually curved projection attached to the rear bottom of a surfboard for stability.
d. A projecting vane used for cooling, as on a radiator or an engine cylinder.
e. See tail fin.
v. finned, fin·ning, fins
To equip with fins.
1. To emerge with the fins above water.
2. To swim, as a fish.
3. To lash the water with the fins. Used of a dying whale.

[Middle English, from Old English finn.]

fin 2

n. Slang
A five-dollar bill.

[Yiddish finf, five, from Old High German funf, finf; see penkwe in Indo-European roots.]


1. (Zoology) 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
2. a part or appendage that resembles a fin
3. (Aeronautics)
a. Brit a vertical surface to which the rudder is attached, usually placed at the rear of an aeroplane to give stability about the vertical axis. US name: vertical stabilizer
b. a tail surface fixed to a rocket or missile to give stability
4. (Nautical Terms) nautical a fixed or adjustable blade projecting under water from the hull of a vessel to give it stability or control
5. (Mechanical Engineering) a projecting rib to dissipate heat from the surface of an engine cylinder, motor casing, or radiator
6. (Swimming, Water Sports & Surfing) (often plural) another name for flipper2
vb, fins, finning or finned
7. (tr) to provide with fins
8. (Zoology) (tr) to remove the fins from (a dead fish)
9. (Zoology) (intr) (esp of a whale) to agitate the fins violently in the water
[Old English finn; related to Middle Dutch vinne, Old Swedish fina, Latin pinna wing]
ˈfinless adj


slang US a five-dollar bill
[from Yiddish finf five, ultimately from Old High German funf, finf]


abbreviation for
1. (Placename) Finland
2. (Placename) Finnish


abbreviation for
(Automotive Engineering) Finland (international car registration)



n., v. finned, fin•ning. n.
1. a membranous, winglike or paddlelike organ attached to any of various parts of the body of certain aquatic animals.
2. a winglike appendage to a hull, as one for controlling the dive of a submarine.
3. any of certain small, subsidiary structures on an aircraft, designed to increase directional stability.
4. any of a number of standing ridges, as on a radiator or engine cylinder, intended to maximize heat transfer to the surrounding air.
5. (on an automobile body) a fin-shaped ornamental part, esp. on a rear fender (tail fin).
6. Usu., fins. flipper (def. 2).
7. to provide with fins.
8. to lash the water with the fins.
[before 1000; Middle English, Old English finn]
fin′less, adj.
fin′like`, adj.



Slang. a five-dollar bill.
[1865–70; earlier finnip, fin(n)if(f) a five-pound note < Yiddish fin(e)f five < Middle High German vumf, vimf; see five]


1. Finland.
2. Finnish.


1. finance.
2. financial.
3. finish.
click for a larger image
fins on a typical bony fish


One of the wing-like or paddle-like parts of a fish, dolphin, or whale that are used for propelling, steering, and balancing the in water.


Past participle: finned
Gerund: finning

I fin
you fin
he/she/it fins
we fin
you fin
they fin
I finned
you finned
he/she/it finned
we finned
you finned
they finned
Present Continuous
I am finning
you are finning
he/she/it is finning
we are finning
you are finning
they are finning
Present Perfect
I have finned
you have finned
he/she/it has finned
we have finned
you have finned
they have finned
Past Continuous
I was finning
you were finning
he/she/it was finning
we were finning
you were finning
they were finning
Past Perfect
I had finned
you had finned
he/she/it had finned
we had finned
you had finned
they had finned
I will fin
you will fin
he/she/it will fin
we will fin
you will fin
they will fin
Future Perfect
I will have finned
you will have finned
he/she/it will have finned
we will have finned
you will have finned
they will have finned
Future Continuous
I will be finning
you will be finning
he/she/it will be finning
we will be finning
you will be finning
they will be finning
Present Perfect Continuous
I have been finning
you have been finning
he/she/it has been finning
we have been finning
you have been finning
they have been finning
Future Perfect Continuous
I will have been finning
you will have been finning
he/she/it will have been finning
we will have been finning
you will have been finning
they will have been finning
Past Perfect Continuous
I had been finning
you had been finning
he/she/it had been finning
we had been finning
you had been finning
they had been finning
I would fin
you would fin
he/she/it would fin
we would fin
you would fin
they would fin
Past Conditional
I would have finned
you would have finned
he/she/it would have finned
we would have finned
you would have finned
they would have finned
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.fin - the cardinal number that is the sum of four and onefin - the cardinal number that is the sum of four and one
digit, figure - one of the elements that collectively form a system of numeration; "0 and 1 are digits"
2.fin - one of a pair of decorations projecting above the rear fenders of an automobile
auto, automobile, car, motorcar, machine - a motor vehicle with four wheels; usually propelled by an internal combustion engine; "he needs a car to get to work"
decoration, ornament, ornamentation - something used to beautify
3.fin - one of a set of parallel slats in a door or window to admit air and reject rainfin - one of a set of parallel slats in a door or window to admit air and reject rain
jalousie - a shutter made of angled slats
slat, spline - a thin strip (wood or metal)
4.fin - a shoe for swimmingfin - a shoe for swimming; the paddle-like front is an aid in swimming (especially underwater)
shoe - footwear shaped to fit the foot (below the ankle) with a flexible upper of leather or plastic and a sole and heel of heavier material
5.fin - a stabilizer on a ship that resembles the fin of a fish
ship - a vessel that carries passengers or freight
stabiliser, stabilizer - a device for making something stable
vane - a fin attached to the tail of an arrow, bomb or missile in order to stabilize or guide it
6.fin - organ of locomotion and balance in fishes and some other aquatic animals
ray - any of the stiff bony spines in the fin of a fish
dorsal fin - unpaired median fin on the backs of fishes and some other aquatic vertebrates that help to maintain balance
pectoral fin - either of a pair of fins situated just behind the head in fishes that help control the direction of movement
pelvic fin, ventral fin - either of a pair of fins attached to the pelvic girdle in fishes that help control the direction of movement; correspond to hind limbs of a land vertebrate
caudal fin, tail fin - the tail of fishes and some other aquatic vertebrates
fish - any of various mostly cold-blooded aquatic vertebrates usually having scales and breathing through gills; "the shark is a large fish"; "in the living room there was a tank of colorful fish"
appendage, extremity, member - an external body part that projects from the body; "it is important to keep the extremities warm"
Verb1.fin - equip (a car) with fins
equip, fit out, outfit, fit - provide with (something) usually for a specific purpose; "The expedition was equipped with proper clothing, food, and other necessities"
2.fin - propel oneself through the water in a finning motion
aquatics, water sport - sports that involve bodies of water
swim - travel through water; "We had to swim for 20 minutes to reach the shore"; "a big fish was swimming in the tank"
3.fin - show the fins above the water while swimming; "The sharks were finning near the surface"
swim - travel through water; "We had to swim for 20 minutes to reach the shore"; "a big fish was swimming in the tank"
زِعْنِفَة السَّمَكزعنِفَة ذَيل الطائِرَه
ploutevsměrové kormidlo
függõleges vezérsík
uggiuggi, stélkambur
smerové kormidlo


[fɪn] N (all senses) → aleta f


[ˈfɪn] n [fish] → nageoire f


(of fish)Flosse f
(Aviat) → Seitenleitwerk nt, → Seitenflosse f; (of bomb, rocket, ship)Stabilisierungsfläche f
(Aut, of radiator) → Kühlrippe f
(for swimming) → Schwimmflosse f


[fɪn] n (of fish) → pinna; (of plane, bomb) → impennaggio verticale


(fin) noun
1. a thin movable part on a fish's body by which it balances, moves, changes direction etc.
2. anything that looks or is used like a fin. the tail-fin of an aeroplane.
References in classic literature ?
He has no fins on his back (most other porpoises have), he has a lovely tail, and sentimental Indian eyes of a hazel hue.
One voyager in Purchas calls them the wondrous whiskers inside of the whale's mouth; another, hogs' bristles; a third old gentleman in Hackluyt uses the following elegant language: There are about two hundred and fifty fins growing on each side of his upper chop, which arch over his tongue on each side of his mouth.
During their games, their bounds, while rivalling each other in beauty, brightness, and velocity, I distinguished the green labre; the banded mullet, marked by a double line of black; the round-tailed goby, of a white colour, with violet spots on the back; the Japanese scombrus, a beautiful mackerel of these seas, with a blue body and silvery head; the brilliant azurors, whose name alone defies description; some banded spares, with variegated fins of blue and yellow; the woodcocks of the seas, some specimens of which attain a yard in length; Japanese salamanders, spider lampreys, serpents six feet long, with eyes small and lively, and a huge mouth bristling with teeth; with many other species.
I found the little fellow standing in the passage, and being addressed by one of the men in livery, who stood before him, nearly bent double from extreme respectfulness, with his hands hanging in front of him like the fins of a fish.
The animal was only distinguishable, at that distance, by a slight but almost imperceptible motion of its fins and tail.
Although this beast approached us, as I have before said, with the greatest rapidity, it must have been moved altogether by necromancy- for it had neither fins like a fish nor web-feet like a duck, nor wings like the seashell which is blown along in the manner of a vessel; nor yet did it writhe itself forward as do the eels.
It was now at the summit of what seemed to be a long white pole, near the top of which were two pendant white masses, like rudimentary arms or fins.
Great slate-colored backs and high serrated dorsal fins shot up with a fringe of silver, and then rolled down into the depths again.
The tendency of the whole affair to roll was partly corrected by a horizontal lateral fin on either side, and steering was chiefly effected by two vertical fins, which normally lay back like gill-flaps on either side of the head.
If about a dozen genera of birds had become extinct or were unknown, who would have ventured to have surmised that birds might have existed which used their wings solely as flappers, like the logger-headed duck(Micropterus of Eyton); as fins in the water and front legs on the land, like the penguin; as sails, like the ostrich; and functionally for no purpose, like the Apteryx.
In such transparent and seemingly bottomless water, reflecting the clouds, I seemed to be floating through the air as in a balloon, and their swimming impressed me as a kind of flight or hovering, as if they were a compact flock of birds passing just beneath my level on the right or left, their fins, like sails, set all around them.
His faculties refer to natures out of him and predict the world he is to inhabit, as the fins of the fish foreshow that water exists, or the wings of an eagle in the egg presuppose air.