Proterozoic Hear it!

Proterozoic definition

Prot·ero·zoic (prät′ə rə zō′ik, prōt′-)

adjective

designating or of the geologic eon characterized by the development of sedimentary rock, shallow seas, and the first soft-bodied, marine invertebrates; Precambrian, esp. late Precambrian

Etymology: < Gr proteros, former, compar. of pro, forward (see pro-) + zo- + -ic

Proterozoic Idioms

the Proterozoic

the Proterozoic Eon or its rocks

Webster's New World College Dictionary Copyright © 2005 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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