Definition of "Mesozoic"

Mesozoic

adjective
comparative more Mesozoic, superlative most Mesozoic
1. (geology) Of a geologic era within the Phanerozoic eon that comprises the Triassic, Jurassic and Cretaceous periods from about 230 to 65 million years ago, when life on earth was dominated by reptiles.
proper noun
1. (geology) The Mesozoic era.
  Quotations
  The whole history of the earth is divided into five eras, with corresponding rock-systems. These are: 1. Archæan or Eozoic1 era, embodied in the Laurentian system; 2. Palæozoic2 era, embodied in the Palæozoic or Primary system; 3. Mesozoic3 era, recorded in the Secondary system; 4. Cenozoic,4 recorded in the Tertiary and Quaternary systems; and, 5. The Psychozoic era, or era of Mind, recorded in the recent system.
  1883, Joseph Le Conte, Elements of Geology: A Text-book for Colleges and for the General Reader, New York: D. Appleton and Company
  The Mesozoic landscape of southeastern Utah can tell us much about the past, and it's one of the most intriguing and beautiful landscapes on Earth.
  2012, Chinle Miller, In Mesozoic Lands: The Mesozoic Geology of Arches and Canyonlands National Parks, Kindle edition