OPTIC ANGLE

\ˈɒptɪk ˈaŋɡə͡l], \ˈɒptɪk ˈaŋɡə‍l], \ˈɒ_p_t_ɪ_k ˈa_ŋ_ɡ_əl]\
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1920 - A practical medical dictionary.
By Stedman, Thomas Lathrop
 
1898 - American pocket medical dictionary
By Willam Alexander Newman Dorland
 
1916 - Appleton's medical dictionary
By Smith Ely Jelliffe