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Proterozoic▼(of eon from 2,500 to 541 million years ago)adjective[UK: prˌəʊtrəzˈəʊɪk] [US: prˌoʊtrəzˈoʊɪk]
Proterozoic▼(eon 2,500-541 Ma)proper noun[UK: prˌəʊtrəzˈəʊɪk] [US: prˌoʊtrəzˈoʊɪk]
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