HARMONOMETER

\hˌɑːmənˈɒmɪtə], \hˌɑːmənˈɒmɪtə], \h_ˌɑː_m_ə_n_ˈɒ_m_ɪ_t_ə]\
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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