INTERVARIETAL

\ˌɪntəvˈe͡əɹa͡ɪ͡ətə͡l], \ˌɪntəvˈe‍əɹa‍ɪ‍ətə‍l], \ˌɪ_n_t_ə_v_ˈeə_ɹ_aɪə_t_əl]\
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1920 - A dictionary of scientific terms (6th edition)
By J.H. Kenneth