PENTAHEDRICAL

\pˌɛntɐhˈɛdɹɪkə͡l], \pˌɛntɐhˈɛdɹɪkə‍l], \p_ˌɛ_n_t_ɐ_h_ˈɛ_d_ɹ_ɪ_k_əl]\
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2010 - New Age Dictionary Database
By Oddity Software
 
1913 - Webster's Revised Unabridged Dictionary
By Noah Webster.