PERIODIC LAW

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