dinosaur

[dahy-nuh-sawr]
noun
1.
any chiefly terrestrial, herbivorous or carnivorous reptile of the extinct orders Saurischia and Ornithischia, from the Mesozoic Era, certain species of which are the largest known land animals.
2.
something that is unwieldy in size, anachronistically outmoded, or unable to adapt to change: The old steel mill was a dinosaur that cost the company millions to operate.

Origin:
< Neo-Latin Dinosaurus (1841), originally a genus name. See dino-, -saur

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World English Dictionary
dinosaur (ˈdaɪnəˌsɔː)
 
n
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  a person or thing that is considered to be out of date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]
 
dino'saurian
 
adj

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

dinosaur
1841, coined by Sir Richard Owen, from Gk. deinos "terrible" + sauros "lizard," of unknown origin. Fig. sense of "person or institution not adapting to change" is from 1952.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
dinosaur  [%PREMIUM_LINK%]     (dī'nə-sôr')  Pronunciation Key 
Any of various extinct reptiles of the orders Saurischia and Ornithischia that flourished during the Mesozoic Era. Dinosaurs were carnivorous or herbivorous, dwelled mostly on land, and varied from the size of a small dog to the largest land animals that ever lived. One group of dinosaurs evolved into birds. See more at ornithischian, saurischian. See Note at bird.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

dinosaurs definition


Reptiles, now extinct, that were the dominant life form on Earth for many millions of years. The name dinosaur comes from the Greek words for “monstrous lizard.” Dinosaurs became extinct suddenly, about sixty-five million years ago. Scientists now believe that their extinction was caused by the impact of a large asteroid on the Earth.

Note: Some dinosaurs were very large and had small brains — factors that may in part have led to their extinction. The term is often used to refer to something or someone that is antiquated and unable to adapt to change: “The old cavalry generals couldn't adjust to the use of tanks — they became dinosaurs.”
Note: Commonly known dinosaurs include Tyrannosaurus rex, Brontosaurus, Stegosaurus, and Triceratops.
Note: Some scientists believe that modern birds are the descendants of dinosaurs.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Slang Dictionary

dinosaur

n.
1. Any hardware requiring raised flooring and special power. Used especially of old minis and mainframes, in contrast with newer microprocessor-based machines. In a famous quote from the 1988 Unix EXPO, Bill Joy compared the liquid-cooled mainframe in the massive IBM display with a grazing dinosaur "with a truck outside pumping its bodily fluids through it". IBM was not amused. Compare big iron; see also mainframe.
2. [IBM] A very conservative user; a zipperhead.
Example sentences
The print-bound critics are lumbering dinosaurs grousing about their own
  extinction.
Those who lament the end of journalism's days are dinosaurs who don't see
  beyond dead-tree news.
But dinosaurs never became a big or truly pervasive cultural icon, and some
  decades largely ignored them.
They were not some early croc offshoot that filled the niche that would later
  be occupied by predatory dinosaurs.
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