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⇱ fin. - WordReference.com Dictionary of English


Collins Concise English Dictionary © HarperCollins Publishers::
fin. abbreviation for
  1. finance
  2. financial
WordReference Random House Learner's Dictionary of American English © 2026
fin1 /fɪn/USA pronunciation   n. [countable]
  1. Zoologya winglike or paddlelike part on the body of fishes and certain other water animals, used for movement, steering, or balancing.
  2. any part resembling a fin, such as part of a boat or an aircraft.
  3. ZoologyUsually, fins. [plural] flipper (def. 2).
finned, adj. 

-fin-  root. 
  1. -fin- comes from Latin, where it has the meaning "end;
    complete;
    limit.'' This meaning is found in such words as: confine, define, definite, definition, final, finale, finance, fine, finish, finite, indefinite.

fin.,  an abbreviation of:
  1. finance.
  2. financial.
  3. finish.

WordReference Random House Unabridged Dictionary of American English © 2026
fin1  (fin),USA pronunciation n., v., finned, fin•ning. 
n. 
  1. Zoologya 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. [Naut.]
    • Naval Termsa 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.
    • Naval TermsSee fin keel. 
  3. AeronauticsAlso called vertical stabilizer. 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. Metallurgya 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. Cf. flash (def. 11).
  7. Automotivean ornamental structure resembling an aeronautical fin that is attached to the body of an automobile, as on each rear fender (tail fin.)
  8. Slang Termsthe arm or hand.
  9. ZoologyUsually, fins. flipper (def. 2).

v.t. 
  1. to cut off the fins from (a fish);
    carve or cut up, as a chub.
  2. to provide or equip with a fin or fins.

v.i. 
  1. Zoologyto move the fins;
    lash the water with the fins, as a whale when dying.
  • bef. 1000; Middle English, Old English finn; cognate with Dutch vin, Low German finne; akin to Swedish fena
fin′less, adj. 
fin′like′, adj. 

fin2  (fin),USA pronunciation n. 
  1. Slang Termsa five-dollar bill.
  • Middle High German vumf, vimf; see five
  • Yiddish fin(e)f five
  • earlier finnip, finnup, fin(n)if(f ) a five-pound note 1865–70

Fin., 
    1. Finland.
    2. Finnish.

fin., 
    1. finance.
    2. financial.
    3. finish.

'fin.' also found in these entries (note: many are not synonyms or translations):

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