TRIGONOCEPHALUS

\tɹˈɪɡənˌə͡ʊsfaləs], \tɹˈɪɡənˌə‍ʊsfaləs], \t_ɹ_ˈɪ_ɡ_ə_n_ˌəʊ_s_f_a_l_ə_s]\
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1900 - A dictionary of medicine and the allied sciences
By Alexander Duane
 
1916 - Appleton's medical dictionary
By Smith Ely Jelliffe