fin, n. [OE. finne, fin, AS. finn; akin to D. vin, G. & Dan. finne, Sw. fena, L. pinna, penna, a wing, feather. Cf. pen a feather.].

An organ of a fish, consisting of a membrane supported by rays, or little bony or cartilaginous ossicles, and serving to balance and propel it in the water. [1913 Webster]
" Fishes move through the water chiefly by means of the caudal fin or tail, the principal office of the other fins being to balance or direct the body, though they are also, to a certain extent, employed in producing motion." [1913 Webster]
A membranous, finlike, swimming organ, as in pteropod and heteropod mollusks. [1913 Webster]
A finlike organ or attachment; a part of an object or product which protrudes like a fin McElrath. (c) (Mech.)

A finlike appendage, as to submarine boats. [1913 Webster]

A fixed stabilizing surface, usually vertical, similar in purpose to a bilge keel on a ship. [Webster 1913 Suppl.]

Apidose fin. (Zoöl.) See under Adipose, a. -- Fin ray (Anat.), one of the hornlike, cartilaginous, or bony, dermal rods which form the skeleton of the fins of fishes. -- Fin whale (Zoöl.), a finback. -- Paired fins (Zoöl.), the pectoral and ventral fins, corresponding to the fore and hind legs of the higher animals. -- Unpaired fins, or Median fins (Zoöl.), the dorsal, caudal, and anal fins.

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OXFORD DICTIONARY

fin, n. & v.
--n.
1 an organ on various parts of the body of many aquatic vertebrates and some invertebrates, including fish and cetaceans, for propelling, steering, and balancing (dorsal fin; anal fin).
2 a small projecting surface or attachment on an aircraft, rocket, or motor car for ensuring aerodynamic stability.
3 an underwater swimmer's flipper.
4 a sharp lateral projection on the share or coulter of a plough.
5 a finlike projection on any device, for improving heat transfer etc.
--v. (finned, finning)
1 tr. provide with fins.
2 intr. swim under water.

Idiom

fin-back (or fin whale) a rorqual, Balaenoptera physalus.

Derivative

finless adj. finned adj. (also in comb.).

Etymology

OE fin(n)

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THESAURUS

fin
Australian crawl, C, C-note, G, G-note, Little Phoebe, Pentateuch, Phoebe, V, aquaplaning, aquatics, backstroke, balneation, bathe, bathing, breaststroke, buck, butterfly, cartwheel, cent, century, cinque, copper, crawl, dime, diving, dog paddle, dollar, dollar bill, fifty cents, fish, fishtail, five, five bucks, five cents, five dollars, five hundred dollars, five-dollar bill, five-hundred-dollar bill, five-spot, fiver, fivesome, flapper, flipper, floating, four bits, frogskin, grand, half G, half a C, half dollar, half grand, hundred-dollar bill, iron man, mill, mullet, natation, nickel, penny, pentachord, pentad, pentagon, pentagram, pentahedron, pentameter, pentapody, pentarchy, pentastich, pentathlon, quarter, quincunx, quint, quintet, quintuplet, red cent, sawbuck, sidestroke, silver dollar, skin, smacker, surfboarding, surfing, swim, swimming, ten cents, ten-spot, tenner, thousand dollars, thousand-dollar bill, treading water, twenty-dollar bill, twenty-five cents, two bits, two-dollar bill, two-spot, wading, waterskiing, yard

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ROGET THESAURUS

fin

Money
N money, legal tender, money matters, money market, finance, accounts, funds, treasure, capital, stock, assets, wealth, supplies, ways and means, wherewithal, sinews of war, almighty dollar, needful, cash, mammon, dough, cabbage, money-like instruments, M, M, sum, amount, balance, balance sheet, sum total, proceeds, currency, circulating medium, specie, coin, piece, hard cash, cold cash, dollar, sterling coin, pounds shillings and pence, Ls, d, pocket, breeches pocket, purse, money in hand, cash at hand, ready money, ready cash, slug, wad wad of bills, wad of money, thick wad of bills, roll of dough, rhino, blunt, dust, mopus, tin, salt, chink, argent comptant, bottom dollar, buzzard dollar, checks, dibs, double eagle, eagle, Federal currency, fractional currency, postal currency, Federal Reserve Note, United States Note, silver certificate, gold certificate, long bit, short bit, moss, nickel, pile, pin money, quarter, red cent, roanoke, rock, seawan, seawant, thousand dollars, grand, single, one-dollar bill, two- dollar bill, five-dollar bill, fiver, fin, Lincoln, ten-dollar bill, sawbuck, twenty-dollar bill, Jackson, double sawbuck, fifty-dollar bill, hundred-dollar bill, C-note, penny, cent, Lincoln cent, indian head penny, copper, two-cent piece three-cent piece, half- dime, nickel, buffalo nickel, V nickel, dime, disme, mercury dime, quarter, two bits, half dollar, dollar, silver dollar, Eisenhower dollar, Susan B, Anthony dollar, precious metals, gold, silver, copper, bullion, ingot, nugget, petty cash, pocket money, change, small change, small coin, doit, stiver, rap, mite, farthing, sou, penny, shilling, tester, groat, guinea, rouleau, wampum, good sum, round sum, lump sum, power of money, plum, lac of rupees, major coin, crown, minor coin, monetarist, monetary theory, numismatics, chrysology, numismatist, paper money, greenback, major denomination, minor denomination, money order, postal money order, Post Office order, bank note, bond, bill, bill of exchange, order, warrant, coupon, debenture, exchequer bill, assignat, blueback, hundi, shinplaster, note, note of hand, promissory note, I O U, draft, check, cheque, back-dated check, negotiable order of withdrawal, NOW, remittance, credit, liability, drawer, drawee, obligor, obligee, moneyer, coiner, false money, bad money, base coin, flash note, slip, kite, fancy stocks, Bank of Elegance, argumentum ad crumenam, letter of credit, circulation, multiplier effect, inflation, double-digit inflation, hyperinflation, erosion of the currency, debasement of the currency, deflation, stagflation, exchange rate, rate of exchange, floating exchange rates, fixed rates, currency counter, currency exchange, bureau de change, gold-backed currency, gold standard, silver standard, bank account, savings account, checking account, money market account, NOW account, time deposit, deposit, demand deposit, super NOW account, certificate of deposit, CD, $, US$, Y, A$, Federal Reserve Bank, central bank, Federal Reserve Board, board of governors of the Federal Reserve, Treasury Department, Secret Service, mint, bureau of engraving, seigniorage, counterfeit, funny money, bogus money, (falsehood), interest, interest rate, discount rate, monetary, pecuniary, crumenal, fiscal, financial, sumptuary, numismatic, numismatical, sterling, nummary, barbarus ipse placet dummodo sit dives, but the jingling of the guinea helps the hurt that, Gelt regiert die Welt, money rules the world, money makes the world go round, nervos belli pecuniam infinitam, redet Geld so schweigt die Welt, money is the mother's milk of politics, money is the root of all evil, money isn't everything, as phony as a three-dollar bill, don't take any wooden nickels.

Navigation
N navigation, aquatics, boating, yachting, ship, oar, paddle, screw, sail, canvas, aileron, natation, swimming, fin, flipper, fish's tail, aerostation, aerostatics, aeronautics, balloonery, balloon, ballooning, aviation, airmanship, flying, flight, volitation, wing, pinion, rocketry, space travel, astronautics, orbital mechanics, orbiting, voyage, sail, cruise, passage, circumnavigation, periplus, headway, sternway, leeway, fairway, mariner, flight, trip, shuttle, run, airlift, sailing, volant, aerostatic, seafaring, nautical, maritime, naval, seagoing, coasting, afloat, navigable, aerial, aeronautic, grallatory, under way, under sail, under canvas, under steam, on the wing, in flight, in orbit, bon voyage, spread the thin oar and catch the driving gale.

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