of or resembling cartilage.
having a skeleton composed either entirely or mainly of cartilage, as vertebrates of the class Chondrichthyes, which includes the sharks, rays, and skates.

1375–1425; late Middle English < Latin cartilāginōsus, equivalent to cartilāgin- (stem of cartilāgō) cartilage + -ōsus -ous

intercartilaginous, adjective
postcartilaginous, adjective
precartilaginous, adjective
pseudocartilaginous, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
cartilage (ˈkɑːtɪlɪdʒ, ˈkɑːtlɪdʒ)
Nontechnical name: gristle a tough elastic tissue composing most of the embryonic skeleton of vertebrates. In the adults of higher vertebrates it is mostly converted into bone, remaining only on the articulating ends of bones, in the thorax, trachea, nose, and ears
[C16: from Latin cartilāgō]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1540s, from L. cartilaginosus, from cartilaginem (nom. cartilago) "cartilage, gristle."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

cartilaginous car·ti·lag·i·nous (kär'tl-āj'ə-nəs)

  1. Chondral.

  2. Having a skeleton consisting primarily of cartilage.

  3. Having the texture of cartilage.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Sharks and rays can be heavier, but they're cartilaginous fish.
The cartilaginous fish, so-called because cartilage formed their skeletons,
  later gave rise to sharks and rays.
Sharks are cartilaginous fish, which means that their skeletons are made of
  cartilage, not bone.
One role may stem from the shark's cartilaginous skeleton.
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