Paleozoic

[ pey-lee-uh-zoh-ik or, especially British, pal-ee- ]
/ ˌpeɪ li əˈzoʊ ɪk or, especially British, ˌpæl i- /
Geology

adjective

noting or pertaining to an era occurring between 570 million and 230 million years ago, characterized by the advent of fish, insects, and reptiles.

noun

the Paleozoic Era or group of systems.

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Origin of Paleozoic

1830–40; paleo- + -zoic<Greek zōïkós pertaining to animals; see zo-, -ic

OTHER WORDS FROM Paleozoic

post-Pa·le·o·zo·ic, adjectivepre-Pa·le·o·zo·ic, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for Paleozoic

Scientific definitions for Paleozoic

Paleozoic
[ pā′lē-ə-zōĭk ]

The era of geologic time from about 540 to 245 million years ago. The beginning of the Paleozoic Era is characterized by a great diversity of marine invertebrate animals. Primitive fish and reptiles, land plants, and insects also first appeared during this time. The end of the Paleozoic is marked by the largest recorded mass extinction in the Earth's history, which wiped out nearly 90% of known marine life forms. See Chart at geologic time.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.