IDIOPHTHARTOSOME

\ˌɪdɪəfθˈɑːtə͡ʊsˌə͡ʊm], \ˌɪdɪəfθˈɑːtə‍ʊsˌə‍ʊm], \ˌɪ_d_ɪ__ə_f_θ_ˈɑː_t_əʊ_s_ˌəʊ_m]\
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1920 - A dictionary of scientific terms (6th edition)
By J.H. Kenneth