DODECAPETALOUS

\də͡ʊdˈɛkɐpˌɛtələs], \də‍ʊdˈɛkɐpˌɛtələs], \d_əʊ_d_ˈɛ_k_ɐ_p_ˌɛ_t_ə_l_ə_s]\
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1908 - Chambers's Twentieth Century Dictionary of the English Language
By Thomas Davidson