permian Meaning, Definition & Usage

  1. noun from 280 million to 230 million years ago; reptiles
    Permian period.

WordNet

Per"mi*an adjective
Etymology
From the ancient kingdom of Permia, where the Permian formation exists.
Definitions
  1. (Geol.) Belonging or relating to the period, and also to the formation, next following the Carboniferous, and regarded as closing the Carboniferous age and Paleozoic era. -- n. The Permian period. See Chart of Geology.

Webster 1913