IDIOCALYPTROSOME

\ˌɪdɪˌɒkɐlˈɪptɹə͡ʊsˌə͡ʊm], \ˌɪdɪˌɒkɐlˈɪptɹə‍ʊsˌə‍ʊm], \ˌɪ_d_ɪ__ˌɒ_k_ɐ_l_ˈɪ_p_t_ɹ_əʊ_s_ˌəʊ_m]\
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1920 - A dictionary of scientific terms (6th edition)
By J.H. Kenneth