ANGULAR APERTURE

\ˈanɡjʊləɹ ˈapət͡ʃə], \ˈanɡjʊləɹ ˈapət‍ʃə], \ˈa_n_ɡ_j_ʊ_l_ə_ɹ ˈa_p_ə_tʃ_ə]\
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1920 - A practical medical dictionary.
By Stedman, Thomas Lathrop
 
1916 - Appleton's medical dictionary
By Smith Ely Jelliffe