HYPOTRACHELIUM

\hˌa͡ɪpə͡ʊtɹɐkˈiːli͡əm], \hˌa‍ɪpə‍ʊtɹɐkˈiːli‍əm], \h_ˌaɪ_p_əʊ_t_ɹ_ɐ_k_ˈiː_l_iə_m]\
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2010 - New Age Dictionary Database
By Oddity Software
 
1913 - Webster's Revised Unabridged Dictionary
By Noah Webster.