Etymology
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Paleozoic (adj.)

in reference to the geological era between the Precambrian and the Mesozoic, a geological series characterized by the earliest record of modern life forms, 1838, coined by Adam Sedgwick (1785-1873) from paleo- "ancient" + Greek zoe "life" (from PIE root *gwei- "to live") + -ic.

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Definitions of Paleozoic
1
Paleozoic (n.)
from 544 million to about 230 million years ago;
Synonyms: Paleozoic era
2
Paleozoic (adj.)
of or relating to or denoting the Paleozoic era;
From wordnet.princeton.edu