INTERCILIUM

\ˌɪntəsˈɪli͡əm], \ˌɪntəsˈɪli‍əm], \ˌɪ_n_t_ə_s_ˈɪ_l_iə_m]\
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1908 - Chambers's Twentieth Century Dictionary of the English Language
By Thomas Davidson
 
1898 - American pocket medical dictionary
By Willam Alexander Newman Dorland