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  Dictionary Definition of fin

1. a membranous wing-like or paddle-like 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 a. a fin-shaped plane on a submarine or boat. b. a fin keel. c. a submarine conning tower.
3. Also, Chiefly US, vertical stabiliser. Aeronautics any of certain small, subsidiary planes on an aircraft, in general placed parallel to the plane of symmetry.
4. a small, fin-shaped attachment on the rear underside of a surfboard.
5. flipper (defs 1 and 2).
6. an external rib for cooling, used on radiators, the cylinders of air-cooled internal-combustion engines, etc.
7. any part, as of a mechanism, resembling a fin.
8. Colloquial the arm or hand.
-- verb ( finned, finning )
-- verb (t)
9. to cut off the fins from (a fish); carve or cut up, as a chub.
-- verb (i)
10. to move the fins; lash the water with the fins, as a whale when dying.
[ME finne, OE finn, c. D vin, LG finne. Cf. L pinna ]
-- finless, adjective -- finlike, adjective