INTERCALARIUM

\ˌɪntəkalˈe͡əɹi͡əm], \ˌɪntəkalˈe‍əɹi‍əm], \ˌɪ_n_t_ə_k_a_l_ˈeə_ɹ_iə_m]\
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1920 - A dictionary of scientific terms (6th edition)
By J.H. Kenneth