1.(Zool.) 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 Carcharodon Rondeleti) of tropical seas, and the great blue shark (Carcharhinus glaucus syn. Prionace glauca) 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 (Carcharodon Atwoodi) is thought by some to be a variety, or the young, of Carcharodon carcharias. The dusky shark (Carcharhinus obscurus) is a common species on the coast of the United States of moderate size and not dangerous. It feeds on shellfish and bottom fishes. Note: The following is a list of Atlantic Ocean sharks: Common and Scientific Names of Atlantic Sharks (1) Pelagic Sharks Thresher shark (Alopias vulpinus) Bigeye thresher (Alopias superciliosus) Oceanic whitetip shark (Carcharhinus longimanus) Sevengill shark (Heptrachias perlo) Sixgill shark (Hexanchus griseus) Bigeye sixgill shark (Hexanchus vitulus) Shortfin mako (Isurus oxyrinchus) Longfin mako (Isurus paucus) Porbeagle (Lamna nasus) Blue shark (Prionace glauca) (2)Large Coastal Sharks Sandbar shark (Carcharhinus plumbeus) Reef shark (Carcharhinus perezi) Blacktip shark (Carcharhinus limbatus) Dusky shark (Carcharhinus obscurus) Spinner shark (Carcharhinus brevipinna) Silky shark (Carcharhinus falciformis) Bull shark (Carcharhinus leucas) Bignose shark (Carcharhinus altimus) Galapagos shark (Carcharhinus galapagensis) Night shark (Carcharhinus signatus) White shark (Carcharodon carcharias) Basking shark (Cetorhinus maximus) Tiger shark (Galeocerdo cuvier) Nurse shark (Ginglymostoma cirratum) Lemon shark (Negaprion brevirostris) Ragged-tooth shark (Odontaspis ferox) Whale shark (Rhincodon typus) Scalloped hammerhead (Sphyrna lewini) Great hammerhead (Sphyrna mokarran) Smooth hammerhead (Sphyrna zygaena) (3) Small Coastal Sharks Finetooth shark (Carcharhinus isodon) Blacknose shark (Carcharhinus acronotus) Atlantic sharpnose shark (Rhizoprionodon erraenovae) Caribbean sharpnose shark (Rhizoprionodon porosus) Bonnethead (Sphyrna tiburo) Atlantic angel shark (Squatina dumeril)
2.A rapacious, artful person; a sharper. (Colloq.)
3.Trickery; fraud; petty rapine; as, to live upon the shark. (Obs.)
