fin

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fin1

fins of a typical bony fish (Elizabeth Morales)

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:
   1. A fixed or movable airfoil used to stabilize an aircraft, missile, or projectile in flight.
   2. A thin, usually curved projection attached to the rear bottom of a surfboard for stability.
   3. A projecting vane used for cooling, as on a radiator or an engine cylinder.
   4. See tail fin (sense 2).
3. See flipper (sense 2).

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.]

A five-dollar bill.

[Yiddish finf, five, from Old High German funf, finf.]

1. An extended surface used to increase the heat transfer area, as metal sheets attached to tubes.
2. A thin flange projecting outward from the periphery of the frame of an aluminum window to serve as a means of securing the frame in a wood or masonry opening.
3. A narrow linear projection on a formed concrete surface, resulting from mortar flowing out between spaces in the formwork.
4. A thin projection on a casting or forging resulting from trimming or from the metal under pressure being forced into hairline cracks in the die or around die inserts.
5. A steel sheeting wall which projects from a main coffer-dam structure.

Winglike structure attached to the body of fish and cetaceans; used for steering and propulsion during progress through the water.

• f. rot — a disease of aquarium fish characterized by thickening followed by necrosis of the fin and tail tissues, commencing at the edges, caused by Haemophilus piscum and Aeromonas spp. May be bracketed with fin rot/tail rot/snout erosion. Often associated with suboptimal cultural conditions. Mixed populations of opportunistic bacteria are usually present.

For other uses, see Fin (disambiguation).

Arrow fletches are a type of fin.

A fin is a surface used to produce lift and thrust or to steer while traveling in water, air, or other fluid media. The first use of the word was for the limbs of fish, but has been extended to include other animal limbs and man-made devices.

The foremost use of fins is to ensure the directional stability of an object moving through a fluid such as water or air and may be seen in the use of fletching on arrows and fins at the rear of some missiles, rockets, self-propelled torpedoes, and kinetic energy penetrators. They are typically "planar" (shaped like small wings), although grid fins are sometimes used in specialized cases.

Moving fins may be used to propel an object through lateral thrust (see mechanics).

Examples of fin use:

• Propellers usually have a number of fins that work to translate torquing force to lateral thrust, thus propelling a ship. These are also called blades. In the case of high power application it is important to avoid cavitation, caused by excessive negative pressure, as this can cause noise, a loss of power, and damage to the propeller.
• For scuba divers' fins, see swimfin.
• In surfing, a skeg is a stabilizing fin located at the rear of the surfboard. A skeg has the effect of keeping the board moving forward in a controlled manner. The surfboard fin has undergone numerous phases of development.
• Constructions of the same purpose as fins (producing thrust, but working in gaseous media) instead are usually called wings or stabilizers with aerodynamics as the governing science. The exception to this is the vertical surface of an aircraft to which the rudder is attached - this is usually called the fin, tail fin (UK), or vertical stabilizer (US).
• The fin of a rocket uses pressure on both sides of the fin to create a more stable flight in a rocket

References

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Dansk (Danish)
1.
n. - finne, støbefinne, styrefinne
v. tr. - udstyre med finne
v. intr. - lade finnerne ses over vandet, bevæge sig gennem vand ved hjælp af finner

2.
n. - femdollarseddel

3.

idioms:

• fin de siècle    århundredskiftet

Nederlands (Dutch)
vin, zwemvlies, uitstekende richel (b.v. van radiator), biljet van vijf dollar, hand, van vinnen voorzien, vinnen boven water laten zien, zwemmen m.b.v. vinnen

Français (French)
1.
n. - (Zool) nageoire, aileron (d'un requin), (Aérosp) empennage, (Aut) ailette, (Naut) dérive, palmes (npl)
v. tr. - pourvoir de nageoires
v. intr. - émerger avec les nageoires au-dessus de l'eau

2.
n. - (US) billet de cinq dollars (arg)

3.

idioms:

• fin de siScle    fin de siècle

Deutsch (German)
1.
n. - Flosse, Schwimmflosse, Rippe
v. - mit Flossen versehen

2.
n. - Fünfdollarschein

3.

idioms:

• fin de siècle    Ende des Jahrhunderts

Ελληνική (Greek)
n. - πτερύγιο (ψαριού κ.λπ.), βατραχοπέδιλο
v. - αφαιρώ τα πτερύγια, προσθέτω πτερύγια
abbr. - (γαλλ.) τέλος

idioms:

• fin de siΛcle    τα τέλη του 19ου αιώνα, παρηκμασμένος (καλλιτεχνικά)

Italiano (Italian)
pinna

idioms:

• fin de siècle    fine secolo

Português (Portuguese)
n. - nadadeira (f) (de peixe), estabilizador (m) vertical (Aer.)
v. - cortar as barbatanas, mover as barbatanas, bater a água com as barbatanas ou a cauda

idioms:

• fin de siècle    fim do século 19

Русский (Russian)
плавник, киль, стабилизатор, заусенец, пятидолларовая банкнота

idioms:

• fin de siКcle    характерный для конца 19-го столетия

Español (Spanish)
1.
n. - aleta, pata de rana, barba de ballena, (mecánica) rebaba
v. tr. - cortar las aletas
v. intr. - aletear, mover las aletas

2.
n. - (jer) billete de cinco dólares

3.

idioms:

• fin de siècle    fin de siglo (XIX)

Svenska (Swedish)
n. - fena, tass (sl.), femdollarsedel (amer. sl.)
v. - visa fenorna, piska vatten med fenorna
abbr. - finans, slut

中文（简体）(Chinese (Simplified))
鳍, 鳍状物, 鱼翅, 装上翅, 切除鳍, 猛挥鳍

idioms:

• fin de si奵le    世纪末的, 颓废的

中文（繁體）(Chinese (Traditional))
1.
n. - 5元票面的鈔票

2.

idioms:

• fin de sile    世紀末的, 頹廢的

3.
n. - 鰭, 鰭狀物
v. tr. - 裝上翅, 切除鰭
v. intr. - 猛揮鰭

한국어 (Korean)
1.
n. - 지느러미, 물갈퀴, 수평타
v. tr. - 핀수영을 하다
v. intr. - 핀수영을 하다

2.
n. - 미국 5달러 짜리 지폐

3. 손, 팔

idioms:

• fin de si둩le    19c 말의 전형적인, 세기 말

日本語 (Japanese)
n. - ひれ, ひれに似た物, フィン, 垂直安定板

idioms:

• fin de si劃le    世紀末, 現代的な

العربيه (Arabic)
‏(الاسم) زعنفه السمك أو الطائرة (فعل) يزعنف (اختصار) مختصر finland or finnish : فنلندة أة فنلندي, آخر أو أخير final , نهايه أو انتهى finish‏

עברית (Hebrew)
n. - ‮סנפיר, דבר דמוי-סנפיר‬
v. tr. - ‮כרת סנפירים של דג‬
v. intr. - ‮חתר בסנפירים, שחה מתחת למים‬
n. - ‮חמישה דולרים‬
fin de siΦcle - ‮סוף המאה התשע עשרה‬

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