Definitions for "Mesozoic"
Belonging, or relating, to the secondary or reptilian age, or the era between the Paleozoic and Cenozoic. See Chart of Geology.
An era of geologic history marked by the cycads, evergreen trees, dinosaurs, marine and flying reptiles, and ganoid fishes.
This geologic era represents the time of “Middle” life. The Mesozoic Era lasted from 245 to 66 million years ago. Microfauna - Animals weighing less than 100 pounds.
Keywords:  age, formation
The Mesozoic age or formation.