HYDROSULPHUROUS

\hˈa͡ɪdɹəsˌʌlfjʊɹəs], \hˈa‍ɪdɹəsˌʌlfjʊɹəs], \h_ˈaɪ_d_ɹ_ə_s_ˌʌ_l_f_j_ʊ_ɹ_ə_s]\
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2010 - New Age Dictionary Database
By Oddity Software
 
1913 - Webster's Revised Unabridged Dictionary
By Noah Webster.