mesozoic Meaning, Definition & Usage

  1. noun from 230 million to 63 million years ago
    Age of Reptiles; Mesozoic era.
  2. adjective of or relating to or denoting the Mesozoic era

WordNet

Mes`o*zo"ic adjective
Etymology
Meso- + Gr. life, fr. to live.
Definitions
  1. (Geol.) Belonging, or relating, to the secondary or reptilian age, or the era between the Paleozoic and Cenozoic. See Chart of Geology.
Mes`o*zo"ic noun
Definitions
  1. The Mesozoic age or formation.

Webster 1913