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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
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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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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