PROTOCHLORID

\pɹˈə͡ʊtə͡ʊklˌɔːɹɪd], \pɹˈə‍ʊtə‍ʊklˌɔːɹɪd], \p_ɹ_ˈəʊ_t_əʊ_k_l_ˌɔː_ɹ_ɪ_d]\
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1898 - American pocket medical dictionary
By Willam Alexander Newman Dorland
 
1916 - Appleton's medical dictionary
By Smith Ely Jelliffe