plesiosaurus Meaning, Definition & Usage

  1. noun extinct marine reptile with a small head on a long neck a short tail and four paddle-shaped limbs; of the Jurassic and Cretaceous
    plesiosaur.

WordNet

Ple`si*o*sau"rus noun
Etymology
NL., fr. Gr near + a lizard.
Wordforms
plural Plesiosauri
Definitions
  1. (Paleon.) A genus of large extinct marine reptiles, having a very long neck, a small head, and paddles for swimming. It lived in the Mesozoic age.

Webster 1913