paleozoic Meaning, Definition & Usage

  1. noun from 544 million to about 230 million years ago
    Paleozoic era.
  2. adjective of or relating to or denoting the Paleozoic era

WordNet

Pa`le*o*zo"ic adjective
Etymology
Paleo- + Gr. life, fr. to live.
Definitions
  1. (Geol.) Of or pertaining to, or designating, the older division of geological time during which life is known to have existed, including the Silurian, Devonian, and Carboniferous ages, and also to the life or rocks of those ages. See Chart of Geology.

Webster 1913