Synonyms for proterozoic
- 1. Proterozoic, Proterozoic eon, Proterozoic aeon
- usage: from 2,500 to 544 million years ago; bacteria and fungi; primitive multicellular organisms
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- 1. proterozoic, early (vs. middle) (vs. late)
- usage: formed in the later of two divisions of the Precambrian era; "proterozoic life forms"