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fin1

[fin] /fɪn/
noun
1.
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.
2.
Nautical.
  1. 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.
  2. fin keel.
3.
Also called vertical stabilizer. Aeronautics. any of certain small, subsidiary structures on an aircraft, designed to increase directional stability.
4.
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.
5.
any part, as of a mechanism, resembling a fin.
6.
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).
7.
Automotive. an ornamental structure resembling an aeronautical fin that is attached to the body of an automobile, as on each rear fender (tail fin)
8.
Slang. the arm or hand.
9.
Usually, fins. flipper (def 2).
verb (used with object), finned, finning.
10.
to cut off the fins from (a fish); carve or cut up, as a chub.
11.
to provide or equip with a fin or fins.
verb (used without object), finned, finning.
12.
to move the fins; lash the water with the fins, as a whale when dying.
Origin
1000
before 1000; Middle English, Old English finn; cognate with Dutch vin, Low German finne; akin to Swedish fena
Related forms
finless, adjective
finlike, adjective

fin2

[fin] /fɪn/
noun
1.
Slang. a five-dollar bill.
Origin
1865-70; earlier finnip, finnup, fin(n)if(f) a five-pound note < Yiddish fin(e)f five < Middle High German vumf, vimf; see five
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples for fins
  • The grain carriers will gain additional efficiencies from a unique propulsion system that puts its fins ahead of the propellers.
  • Nerves based in the fish's brain instruct its fins to move, and off it goes.
  • Formal taxonomic systems first identified species based on visual traits such as fins or fur.
  • To increase the efficiency of this process, the top of the heat pipe can be fitted with fins that help remove the heat.
  • The animals are sought for their fins, which are a delicacy in soup.
  • The fish showed discoloration in the form of depigmentation and the beginnings of deformation of fins.
  • It might cool your head, but if it means carrying a backpack of batteries and aluminum fins on your head.
  • Fish studies the movement of the tail and its two side fins, known as flukes.
  • Optimistic drivers of the past imagined a future in which the stubby tail fins of their cars morphed into broad wings.
  • They tend to be bigger than other females, and they have fancier fins and brighter color patterns.
British Dictionary definitions for fins

fin1

/fɪn/
noun
1.
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.
  1. (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
  2. a tail surface fixed to a rocket or missile to give stability
4.
(nautical) a fixed or adjustable blade projecting under water from the hull of a vessel to give it stability or control
5.
a projecting rib to dissipate heat from the surface of an engine cylinder, motor casing, or radiator
6.
(often pl) another name for flipper (sense 2)
verb fins, finning, finned
7.
(transitive) to provide with fins
8.
(transitive) to remove the fins from (a dead fish)
9.
(intransitive) (esp of a whale) to agitate the fins violently in the water
Derived Forms
finless, adjective
Word Origin
Old English finn; related to Middle Dutch vinne, Old Swedish fina, Latin pinna wing

fin2

/fɪn/
noun
1.
(US, slang) a five-dollar bill
Word Origin
from Yiddish finf five, ultimately from Old High German funf, finf

Fin

abbreviation
1.
Finland
2.
Finnish

FIN

abbreviation
1.
Finland (international car registration)
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
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Word Origin and History for fins
fin
O.E. fin, from P.Gmc. *finno (cf. M.L.G. vinne, Du. vin), perhaps from L. pinna "feather, wing," or, less likely, from L. spina "thorn, spine" (see spike (n.1)). U.S. underworld slang sense of "$5 bill" is 1925, from Yiddish finif "five," from Ger. fünf. The same word had been used in England 1868 to mean "five pound note" (earlier finnip, 1839).
Online Etymology Dictionary, © 2010 Douglas Harper
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fins in Science
fin
  (fĭn)   
One of the winglike or paddlelike parts of a fish, dolphin, or whale that are used for propelling, steering, and balancing in water.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Slang definitions & phrases for fins

fin 1

noun
  1. The hand: Reach out your fin and grab it
  2. The arm and hand (1840+)

fin 2

noun

A five-dollar bill; five dollars: I gave my pal a fin/ It was the fin seen round the world. Where Reagan got the five bucks is a mystery

[1920s+ Underworld; fr Yiddish finif, ''five'']


The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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Related Abbreviations for fins

FIN

Finland (international vehicle ID)
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Value for fins

7
8
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