HYDROCYANIC

\hˌa͡ɪdɹəsɪˈanɪk], \hˌa‍ɪdɹəsɪˈanɪk], \h_ˌaɪ_d_ɹ_ə_s_ɪ__ˈa_n_ɪ_k]\
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1874 - Etymological and pronouncing dictionary of the English language
By Stormonth, James, Phelp, P. H.
 
1871 - The Cabinet Dictionary of the English Language