Paleozoic

US:USA pronunciation: respellingUSA pronunciation: respelling(pā′lē ə zōik or, esp. Brit., pal′ē-)



WordReference Random House Unabridged Dictionary of American English © 2020
Pa•le•o•zo•ic  (pā′lē ə zōik or, esp. Brit., pal′ē-),USA pronunciation [Geol.]
adj. 
  1. Geologynoting or pertaining to an era occurring between 570 million and 230 million years ago, characterized by the advent of fish, insects, and reptiles. See table under  geologic time. 

n. 
  1. Geologythe Paleozoic Era or group of systems.
  • Greek zōïkós pertaining to animals; see zo-, -ic
  • paleo- + -zoic 1830–40

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