METALLOIDAL

\mˈɛtə͡lˌɔ͡ɪdə͡l], \mˈɛtə‍lˌɔ‍ɪdə‍l], \m_ˈɛ_t_əl_ˌɔɪ_d_əl]\
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1874 - Etymological and pronouncing dictionary of the English language
By Stormonth, James, Phelp, P. H.