proterozoic

/P R OW0 T ER0 AH0 Z OW1 IH0 K/
adjective
  1. 1

    Of or relating to the geologic eon from 2,500 Ma to 541.0±1.0 Ma.

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Source: https://en.wiktionary.org/wiki/Proterozoic, https://en.wiktionary.org/wiki/proterozoic