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cartilaginous fish

noun
1.
any fish of the class Chondrichthyes, including the sharks, skates, and rays, having a skeleton composed entirely of cartilage
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cartilaginous fish in Science
cartilaginous fish
  (kär'tl-āj'ə-nəs)   
Any of various fishes of the class Selachii (or Chondrichthyes), having a skeleton that is made of cartilage. Cartilaginous fishes breathe through gill slits, of which there are usually five, and their toothlike or platelike scales (called denticles) are made of dentine and enamel. Sharks, rays, skates, sawfish, and chimaeras are cartilaginous fishes. Compare bony fish, jawless fish.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Article for cartilaginous fish

any member of the group of cartilaginous fishes that includes the sharks, skates, chimaeras, and rays. The class is one of the two great groups of living fishes, the other being the osteichthians, or bony fishes. The term Selachii is also sometimes used as the name for the order of sharks.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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