dinosaur Meaning, Definition & Usage

  1. noun any of numerous extinct terrestrial reptiles of the Mesozoic era

WordNet

Di"no*saur, Di`no*sau"ri*an noun (Also<
  • Dinosaur
  • Dinosaurian
)
Etymology
Gr. terrible + lizard.
Definitions
  1. (Paleon.) One of the Dinosauria. Written also deinosaur, and deinosaurian.

Webster 1913