\Shark\, n. [Of uncertain origin; perhaps through OF. fr.
carcharus a kind of dogfish, Gr. karchari`as, so called from
its sharp teeth, fr. ka`rcharos having sharp or jagged teeth;
or perhaps named from its rapacity (cf. {Shark}, v. t. & i.);
cf. Corn. scarceas.]
1. (Zo["o]l.) Any one of numerous species of elasmobranch
   fishes of the order Plagiostomi, found in all seas.
Note: Some sharks, as the basking shark and the whale shark,
      grow to an enormous size, the former becoming forty
      feet or more, and the latter sixty feet or more, in
      length. Most of them are harmless to man, but some are
      exceedingly voracious. The man-eating sharks mostly
      belong to the genera {Carcharhinus}, {Carcharodon}, and
      related genera. They have several rows of large sharp
      teeth with serrated edges, as the great white shark
      ({Carcharodon carcharias, or Rondeleti}) of tropical
      seas, and the great blue shark ({Carcharhinus glaucus})
      of all tropical and temperate seas. The former
      sometimes becomes thirty-six feet long, and is the most
      voracious and dangerous species known. The rare
      man-eating shark of the United States coast
      ({Charcarodon Atwoodi}) is thought by some to be a
      variety, or the young, of {C. carcharias}. The dusky
      shark ({Carcharhinus obscurus}), and the smaller blue
      shark ({C. caudatus}), both common species on the coast
      of the United States, are of moderate size and not
      dangerous. They feed on shellfish and bottom fishes.
2. A rapacious, artful person; a sharper. [Colloq.]
3. Trickery; fraud; petty rapine; as, to live upon the shark.
   [Obs.] --South.
{Baskin shark}, {Liver shark}, {Nurse shark}, {Oil shark},
{Sand shark}, {Tiger shark}, etc. See under {Basking},
   {Liver}, etc. See also {Dogfish}, {Houndfish},
   {Notidanian}, and {Tope}.
{Gray shark}, the sand shark.
{Hammer-headed shark}. See {Hammerhead}.
{Port Jackson shark}. See {Cestraciont}.
{Shark barrow}, the eggcase of a shark; a sea purse.
{Shark ray}. Same as {Angel fish}
   (a), under {Angel}.
{Thrasher} shark, or {Thresher shark}, a large, voracious
   shark. See {Thrasher}.
{Whale shark}, a huge harmless shark ({Rhinodon typicus}) of
   the Indian Ocean. It becomes sixty feet or more in length,
   but has very small teeth.

\Shark\, v. t. [Of uncertain origin; perhaps fr. shark,
n., or perhaps related to E. shear (as hearken to hear), and
originally meaning, to clip off. Cf. {Shirk}.]
To pick or gather indiscriminately or covertly. [Obs.]
--Shak.

\Shark\, v. i. [imp. & p. p. {Sharked}; p. pr. & vb. n.
{Sharking}.]
1. To play the petty thief; to practice fraud or trickery; to
   swindle.
         Neither sharks for a cup or a reckoning. --Bp.
                                               Earle.
2. To live by shifts and stratagems. --Beau. & Fl.