RATIONAL HORIZON

\ɹˈaʃənə͡l həɹˈa͡ɪzən], \ɹˈaʃənə‍l həɹˈa‍ɪzən], \ɹ_ˈa_ʃ_ə_n_əl h_ə_ɹ_ˈaɪ_z_ə_n]\
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1874 - Etymological and pronouncing dictionary of the English language
By Stormonth, James, Phelp, P. H.