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proterozoic |
1 definition found From WordNet r 1.6 [wn]: proterozoic adj : (geology) formed in the later of two divisions of the Precambrian era; "proterozoic life forms" n : from 600 million to 1.5 billion years ago; bacteria and fungi; primitive multicellular organisms [syn: {Proterozoic}, {Preoterozoic era}]
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