The word Palaeozoic is an English adjective that is used to refer to a geologic era that is from about 542 to 250 million years ago. The term may also be used as a proper noun to refer to the Palaeozoic era.
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what is the definition of paleozoic
[pey-lee-uh-zoh-ik or, esp. British, pal-ee-]
noting or pertaining to an era occurring between 570 million and 230 million years ago, characterized by the advent of fish, insects, and reptiles.