Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Scrabble
  • Spanish Central
  • Learner's Dictionary


noun brach·i·o·saur \ˈbra-kē-ō-ˌsȯr\

Definition of brachiosaur

  1. :  any of a genus (Brachiosaurus) of very large sauropod dinosaurs of the Late Jurassic period having a massive body, a very long neck, and forelegs longer than hind legs

Origin and Etymology of brachiosaur

New Latin Brachiosaurs, from brachi- + Greek sauros lizard

First Known Use: 1903

Learn More about brachiosaur

Seen and Heard

What made you want to look up brachiosaur? Please tell us where you read or heard it (including the quote, if possible).