HEPTAHEDRON

\hˌɛptɐhˈiːdɹən], \hˌɛptɐhˈiːdɹən], \h_ˌɛ_p_t_ɐ_h_ˈiː_d_ɹ_ə_n]\
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1899 - The american dictionary of the english language.
By Daniel Lyons