PERIODIC ACID

\pˌi͡əɹɪˈɒdɪk ˈasɪd], \pˌi‍əɹɪˈɒdɪk ˈasɪd], \p_ˌiə_ɹ_ɪ__ˈɒ_d_ɪ_k ˈa_s_ɪ_d]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd
 
2010 - Medical Dictionary Database
By DataStellar Co., Ltd
 
1916 - Appleton's medical dictionary
By Smith Ely Jelliffe

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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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