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1. (adj.) Proterozoic
noting or pertaining to the latter half of the Precambrian Era, from about 2.5 billion to 570 million years ago, when bacteria and marine algae were the principal forms of life.
2. (n.) Proterozoic
the Proterozoic division of geologic time or the rock systems formed then.
Etymology: (1905–10; < Gk
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| Definition of 'proterozoic' |
Princeton's WordNet |
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1. (adj) Proterozoic, Proterozoic eon, Proterozoic aeon
from 2,500 to 544 million years ago; bacteria and fungi; primitive multicellular organisms
2. (adj) proterozoic
formed in the later of two divisions of the Precambrian era
"proterozoic life forms"
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Definitions of proterozoic 
