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Definition of: Mesozoic
(mes′ə·zō′ik, mē′sə-) noun Geol.
The era between the Paleozoic and the Cenozoic, including the Triassic, Jurassic, and Cretaceous periods: characterized by the dominance of the reptiles, the rise of flowering plants, and the beginnings of archaic mammals.
—adjective Of or pertaining to this era. [<MESO- + -ZOIC]
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