Fin /(fĭn)/

Fin

v. t.

imp. & p. p. Finned; p. pr. & vb. n. Finning

  1. To carve or cut up, as a chub.

Fin

n.
  1. End; conclusion; object. [Obs.]

Fin

n.
  1. 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. (Zool.)
  2. A membranous, finlike, swimming organ, as in pteropod and heteropod mollusks. (Zool.)
  3. A finlike organ or attachment; a part of an object or product which protrudes like a fin (Com.) [Slang]
  4. A feather; a spline. (Mech.)
  5. A finlike appendage, as to submarine boats.
  6. A fixed stabilizing surface, usually vertical, similar in purpose to a bilge keel on a ship. (Aëronautics)

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