Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Any of various extinct, often gigantic, carnivorous or herbivorous reptiles of the orders Saurischia and Ornithischia that were chiefly terrestrial and existed during the Mesozoic Era.
  • n. A relic of the past: "living dinosaurs of the world of vegetation” ( John Olmsted).
  • n. One that is hopelessly outmoded or unwieldy: "The old, big-city teaching hospital is a dinosaur” ( Peggy Breault).

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Any of various extinct reptiles belonging to the Dinosauria, existing between about 230 million and 65 million years ago.
  • n. A person or organisation which is very old or has very old-fashioned views or is not willing to change and adapt.
  • n. Anything that is no longer in common use or practice.

from the GNU version of the Collaborative International Dictionary of English

  • n. One of the Dinosauria.

from The Century Dictionary and Cyclopedia

  • n. One of the Dinosauria. Also spelled deinosaur.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. any of numerous extinct terrestrial reptiles of the Mesozoic era

Etymologies

New Latin Dīnosauria, group name, from Dīnosaurus, former genus name : Greek deinos, monstrous + Greek sauros, lizard.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Ancient Greek δεινός (deinos, "terrible, awesome, mighty, fearfully great") + σαῦρος (sauros, "lizard, reptile"). (Wiktionary)

Examples

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