Paleozoic
[ pey-lee-uh-zoh-ik or, especially British, pal-ee- ]
/ ˌpeɪ li əˈzoʊ ɪk or, especially British, ˌpæl i- /
Save This Word!
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.
QUIZ
GOOSES. GEESES. I WANT THIS QUIZ ON PLURAL NOUNS!
Test how much you really know about regular and irregular plural nouns with this quiz.
Question 1 of 9
Which of the following nouns has an irregular plural form?
OTHER WORDS FROM Paleozoic
post-Pa·le·o·zo·ic, adjectivepre-Pa·le·o·zo·ic, adjectiveWords nearby Paleozoic
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022
How to use Paleozoic in a sentence
Scientific definitions for Paleozoic
Paleozoic
[ pā′lē-ə-zō′ĭk ]
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.