proterozoic
| 1. |
(satellite adjective) (geology) formed in the later of two divisions of the Precambrian era; "proterozoic life forms" |
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| 2. |
(noun) from 600 million to 1.5 billion years ago; bacteria and fungi; primitive multicellular organisms |
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Synonyms: Preoterozoic era |
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Related Words: era |
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