TRIMONTHLY

\tɹˈa͡ɪmʌnθli], \tɹˈa‍ɪmʌnθli], \t_ɹ_ˈaɪ_m_ʌ_n_θ_l_i]\
Sort: Oldest first
 
1899 - The american dictionary of the english language.
By Daniel Lyons
 
1908 - Chambers's Twentieth Century Dictionary of the English Language
By Thomas Davidson