1. Of or relating to or denoting the Mesozoic era
   "Dinosaurs were the dominant terrestrial vertebrates during the Mesozoic era"

1. The era from 250 million to 66 million years ago, characterized by the dominance of reptiles
   "Dinosaurs ruled during the Mesozoic";
   - Mesozoic era, Age of Reptiles

Type of: era, geological era

Encyclopedia: Mesozoic