\Fin\, v. t. [imp. & p. p. {Finned}; p. pr. & vb. n.
{Finning}.] [Cf. {Fin} of a fish.]
To carve or cut up, as a chub.

\Fin\, n. [See {Fine}, n.]
End; conclusion; object. [Obs.] ``She knew eke the fin of his
intent.'' --Chaucer.

\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.]
1. (Zo["o]l.) 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.
Note: 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.
2. (Zo["o]l.) A membranous, finlike, swimming organ, as in
   pteropod and heteropod mollusks.
3. A finlike organ or attachment; a part of an object or
   product which protrudes like a fin, as:
   (a) The hand. [Slang]
   (b) (Com.) A blade of whalebone. [Eng.] --McElrath.
   (c) (Mech.) A mark or ridge left on a casting at the
       junction of the parts of a mold.
   (d) (Mech.) The thin sheet of metal squeezed out between
       the collars of the rolls in the process of rolling.
       --Raymond.
   (e) (Mech.) A feather; a spline.
4. A finlike appendage, as to submarine boats.
{Apidose fin}. (Zo["o]l.) 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} (Zo["o]l.), a finback.
{Paired fins} (Zo["o]l.), the pectoral and ventral fins,
   corresponding to the fore and hind legs of the higher
   animals.
{Unpaired, or Median}, {fins} (Zo["o]l.), the dorsal, caudal,
   and anal fins.

\Fin\, n. (A["e]ronautics)
A fixed stabilizing surface, usually vertical, similar in
purpose to a bilge keel on a ship.