\fjˈuːzəbə͡l kˈalkjʊləs], \fjˈuːzəbə‍l kˈalkjʊləs], \f_j_ˈuː_z_ə_b_əl k_ˈa_l_k_j_ʊ_l_ə_s]\
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1920 - A practical medical dictionary.
By Stedman, Thomas Lathrop
1898 - American pocket medical dictionary
By Willam Alexander Newman Dorland

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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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