SUBSPIRAL

\sˈʌbspa͡ɪ͡əɹə͡l], \sˈʌbspa‍ɪ‍əɹə‍l], \s_ˈʌ_b_s_p_aɪə_ɹ_əl]\
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1908 - Chambers's Twentieth Century Dictionary of the English Language
By Thomas Davidson