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WordReference Random House Unabridged Dictionary of American English © 2024Prot•er•o•zo•ic (prot′ər ə zō′ik, prō′tər-),USA pronunciation [Geol.]adj. - Geologynoting or pertaining to the latter half of the Precambrian Era, from about 2.5 billion to 570 million years ago, characterized by the appearance of bacteria and marine algae;
Algonkian.
n. - Geologythe Proterozoic division of geologic time or the rock systems formed then;
Algonkian. See table under geologic time.
- protero- + zo- + -ic 1905–10
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