Mes ‧ o ‧ zo ‧ ic /ˌmezəˈzəʊɪk, ˌmes- $ -ˈzoʊ-/ BrE AmE adjective
belonging or relating to the period of time in the Earth's history, from about 250 million years ago to about 65 million years ago, when ↑ dinosaur s , birds, and plants with flowers first started to exist:
the Mesozoic era