IRRECIPROCAL

\ɪɹɪsˈɪpɹəkə͡l], \ɪɹɪsˈɪpɹəkə‍l], \ɪ_ɹ_ɪ_s_ˈɪ_p_ɹ_ə_k_əl]\
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1908 - Chambers's Twentieth Century Dictionary of the English Language
By Thomas Davidson