from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. 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.
  • n. Something resembling a fin in shape or function, as:
  • n. A fixed or movable airfoil used to stabilize an aircraft, missile, or projectile in flight.
  • n. A thin, usually curved projection attached to the rear bottom of a surfboard for stability.
  • n. A projecting vane used for cooling, as on a radiator or an engine cylinder.
  • n. See tail fin.
  • n. See flipper.
  • transitive v. To equip with fins.
  • intransitive v. To emerge with the fins above water.
  • intransitive v. To swim, as a fish.
  • intransitive v. To lash the water with the fins. Used of a dying whale.
  • n. Slang A five-dollar bill.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. One of the appendages of a fish, used to propel itself and to manoeuvre/maneuver.
  • n. A similar appendage of a cetacean or other marine animal.
  • n. A thin, rigid component of an aircraft, extending from the fuselage and used to stabilise and steer the aircraft.
  • n. A similar structure on the tail of a bomb, used to help keep it on course.
  • n. A hairstyle, resembling the fin of a fish, in which the hair is combed and set into a vertical ridge along the top of the head from about the crown to the forehead.
  • n. A device worn by divers and swimmers on their feet.
  • n. An extending part on a surface of a radiator, engine, heatsink, etc., used to facilitate cooling.
  • n. A sharp raised edge (generally in concrete) capable of damaging a roof membrane or vapor retarder.
  • v. To cut the fins from a fish, shark etc
  • v. To swim in the manner of a fish
  • v. To provide (a motor vehicle etc) with fins
  • n. A five-dollar bill.

from the GNU version of the Collaborative International Dictionary of English

  • n. End; conclusion; object.
  • n. 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.
  • n. A membranous, finlike, swimming organ, as in pteropod and heteropod mollusks.
  • n. A finlike organ or attachment; a part of an object or product which protrudes like a fin.
  • n. The hand.
  • n. A blade of whalebone.
  • n. A mark or ridge left on a casting at the junction of the parts of a mold.
  • n. The thin sheet of metal squeezed out between the collars of the rolls in the process of rolling.
  • n. A feather; a spline.
  • n. A finlike appendage, as to submarine boats.
  • n. A fixed stabilizing surface, usually vertical, similar in purpose to a bilge keel on a ship.
  • transitive v. To carve or cut up, as a chub.

from The Century Dictionary and Cyclopedia

  • To carve or cut up, as a fish.
  • To fin out: as, a finning whale.
  • A Middle English form of fine.
  • A dialectal variant of find.
  • n. An extension from the body of an aquatic animal, which serves for propelling, steering, or balancing in the water, and is developed from various parts of the body, generally as an alate or wing-like organ; a pinna.
  • n. In sporting, a general term for fish, as in the phrase “fin, fur, and feather.”
  • n. Something resembling a fin.
  • n. A fin-like organ or attachment, or one appearing or used like a fin; in slang language, the hand.
  • n. The sharp plate in the colter of a plow.
  • n. In molding, a thin projection on the surface of a casting, caused by the imperfect approximation of two molding-boxes, containing each a part of the mold. The fin is formed by the metal running in between the two parting surfaces.
  • n. In com., a blade of whalebone.
  • n. A slip inserted longitudinally into a shaft or arbor, and left projecting so as to form a guide for an object which may slip upon it, but not rotate.
  • n. A tongue on the edge of a board.
  • n. See the adjectives, and def. 1.
  • n. A Middle English form of fine.
  • n. See Finn.
  • n. The thin sheet of metal squeezed out between the collars of the rolls in a roll-train.
  • n. An abbreviation of the Latin ad finem, at or to the end.
  • n. An abbreviation of Finland;
  • n. of Finnish.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. one of a pair of decorations projecting above the rear fenders of an automobile
  • n. organ of locomotion and balance in fishes and some other aquatic animals
  • v. show the fins above the water while swimming
  • n. a shoe for swimming; the paddle-like front is an aid in swimming (especially underwater)
  • n. a stabilizer on a ship that resembles the fin of a fish
  • n. one of a set of parallel slats in a door or window to admit air and reject rain
  • v. propel oneself through the water in a finning motion
  • n. the cardinal number that is the sum of four and one
  • v. equip (a car) with fins


from The American Heritage® Dictionary of the English Language, 4th Edition

Middle English, from Old English finn.
Yiddish finf, five, from Old High German funf, finf; see penkwe in Indo-European roots.

from Wiktionary, Creative Commons Attribution/Share-Alike License

Middle English fin, from Old English finn, from Proto-Germanic *finjō, *finjaz 'dorsal fin' (compare Dutch vin, German Finne, Swedish finne, fena), from Proto-Indo-European *(s)pīn- 'backbone, dorsal fin' (compare Old Irish ind 'end, point', Latin pinna 'feather, wing', Tocharian A spin 'hook', Sanskrit sphyá 'splinter, staff').

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Yiddish פֿינף (finf, "five").



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