ichthyosauria Meaning, Definition & Usage

  1. noun extinct marine reptiles: ichthyosaurs
    order Ichthyosauria.

WordNet

Ich`thy*o*sau"ri*a noun plural
Etymology
NL. See Ichthyosaurus.
Definitions
  1. (Paleon.) An extinct order of marine reptiles, including Ichthyosaurus and allied forms; -- called also Ichthyopterygia. They have not been found later than the Cretaceous period.

Webster 1913