INFRASPINOUS REGION

\ˌɪnfɹəspˈɪnəs ɹˈiːd͡ʒən], \ˌɪnfɹəspˈɪnəs ɹˈiːd‍ʒən], \ˌɪ_n_f_ɹ_ə_s_p_ˈɪ_n_ə_s ɹ_ˈiː_dʒ_ə_n]\
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1898 - American pocket medical dictionary
By Willam Alexander Newman Dorland
 
1916 - Appleton's medical dictionary
By Smith Ely Jelliffe