GERONTOCOMIUM

\d͡ʒˌɛɹəntəkˈə͡ʊmi͡əm], \d‍ʒˌɛɹəntəkˈə‍ʊmi‍əm], \dʒ_ˌɛ_ɹ_ə_n_t_ə_k_ˈəʊ_m_iə_m]\
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1910 - Black's Law Dictionary (2nd edition)
By Henry Campbell Black
 
1895 - Glossary of terms and phrases
By Henry Percy Smith