Etymology
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dinosaur (n.)

one of the Dinosauria, a class of extinct Mesozoic reptiles often of enormous size, 1841, coined in Modern Latin by Sir Richard Owen, from Greek deinos "terrible" (see dire) + sauros "lizard" (see -saurus). Figurative sense of "person or institution not adapting to change" is from 1952. Related: Dinosaurian.

updated on August 20, 2018

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Definitions of dinosaur from WordNet

dinosaur (n.)
any of numerous extinct terrestrial reptiles of the Mesozoic era;
From wordnet.princeton.edu, not affiliated with etymonline.