INTERREGAL

\ˌɪntəɹˈiːɡə͡l], \ˌɪntəɹˈiːɡə‍l], \ˌɪ_n_t_ə_ɹ_ˈiː_ɡ_əl]\
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1908 - Chambers's Twentieth Century Dictionary of the English Language
By Thomas Davidson