I. | ̷ ̷ ̷ ̷|zōik adjective
Usage: usually capitalized
Etymology: mes- + -zoic
: of or relating to a grand division of geological history that includes the entire interval of time between the Permian and the Tertiary and is marked by the dinosaurs, marine and flying reptiles, ganoid fishes, cycads, and evergreen trees — see geologic time table
II. noun
( -s )
Usage: usually capitalized
: the Mesozoic era or system of rocks