SACRUM OR OS-SACRUM

\sˈe͡ɪkɹəm ɔːɹ ˌə͡ʊˈɛssˈe͡ɪkɹəm], \sˈe‍ɪkɹəm ɔːɹ ˌə‍ʊˈɛssˈe‍ɪkɹəm], \s_ˈeɪ_k_ɹ_ə_m ɔː_ɹ ˌəʊ_ˈɛ_s_s_ˈeɪ_k_ɹ_ə_m]\
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1874 - Etymological and pronouncing dictionary of the English language
By Stormonth, James, Phelp, P. H.