plesiosauria Meaning, Definition & Usage

  1. noun any of the plesiosaurs
    suborder Plesiosauria.

WordNet

Ple`si*o*sau"ri*a noun plural
Etymology
NL. See Plesiosaurus.
Definitions
  1. (Paleon.) An extinct order of Mesozoic marine reptiles including the genera Plesiosaurus, and allied forms; -- called also Sauropterygia.

Webster 1913