pertaining to or of the nature of a dinosaur.
a dinosaur.

< Neo-Latin Dinosauri(a) (1841), originally a name for a suborder or tribe (see dino-, saurian) + -an

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dinosaur (ˈdaɪnəˌsɔː)
1.  saurischian See also ornithischian pterosaur Compare plesiosaur any extinct terrestrial reptile of the orders Saurischia and Ornithischia, many of which were of gigantic size and abundant in the Mesozoic era
2.  a person or thing that is considered to be out of date
[C19: from New Latin dinosaurus, from Greek deinos fearful + sauros lizard]

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Example sentences
Eventually the mud will harden, capturing a dinosaurian story in stone.
What few people know, however, is that one group of crocs also imitated
  fearsome dinosaurian predators.
Each of the major dinosaurian groups gets a chapter.
It's that none of the evidence put forth for dinosaurian endothermy actually
  counts as evidence for endothermy.
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