SEMIPRONE POSITION

\sˌɛmɪpɹˈə͡ʊn pəzˈɪʃən], \sˌɛmɪpɹˈə‍ʊn pəzˈɪʃən], \s_ˌɛ_m_ɪ_p_ɹ_ˈəʊ_n p_ə_z_ˈɪ_ʃ_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