VELUM INTERPOSITUM

\vˈɛləm ˌɪntəpˈɒsa͡ɪtəm], \vˈɛləm ˌɪntəpˈɒsa‍ɪtəm], \v_ˈɛ_l_ə_m ˌɪ_n_t_ə_p_ˈɒ_s_aɪ_t_ə_m]\
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1898 - American pocket medical dictionary
By Willam Alexander Newman Dorland
 
1916 - Appleton's medical dictionary
By Smith Ely Jelliffe