HYPOPHOSPHITE

\hˌa͡ɪpə͡ʊfˈɒsfa͡ɪt], \hˌa‍ɪpə‍ʊfˈɒsfa‍ɪt], \h_ˌaɪ_p_əʊ_f_ˈɒ_s_f_aɪ_t]\
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1908 - Chambers's Twentieth Century Dictionary of the English Language
By Thomas Davidson
 
1898 - American pocket medical dictionary
By Willam Alexander Newman Dorland
 
1916 - Appleton's medical dictionary
By Smith Ely Jelliffe