UNDIAPHANOUS

\ʌnda͡ɪˈafənəs], \ʌnda‍ɪˈafənəs], \ʌ_n_d_aɪ__ˈa_f_ə_n_ə_s]\
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1894 - The Clarendon dictionary
By William Hand Browne, Samuel Stehman Haldeman
 
1908 - Chambers's Twentieth Century Dictionary of the English Language
By Thomas Davidson