OCTO-

\ˈɒktə͡ʊ], \ˈɒktə‍ʊ], \ˈɒ_k_t_əʊ]\
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1919 - The Concise Standard Dictionary of the English Language
By James Champlin Fernald

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Archaeozoic Era

  • the time prior to 2,500 million years ago; earth's crust formed; unicellular organisms are earliest forms of life
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