TRIANGULARIS

\tɹa͡ɪˈanɡjʊlˌɑːɹɪs], \tɹa‍ɪˈanɡjʊlˌɑːɹɪs], \t_ɹ_aɪ__ˈa_n_ɡ_j_ʊ_l_ˌɑː_ɹ_ɪ_s]\
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1898 - Warner's pocket medical dictionary of today.
By William R. Warner
 
1900 - A dictionary of medicine and the allied sciences
By Alexander Duane
 
1916 - Appleton's medical dictionary
By Smith Ely Jelliffe