TRIRHOMBOIDAL

\tɹˈɜːhəmbˌɔ͡ɪdə͡l], \tɹˈɜːhəmbˌɔ‍ɪdə‍l], \t_ɹ_ˈɜː_h_ə_m_b_ˌɔɪ_d_əl]\
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2010 - New Age Dictionary Database
By Oddity Software
 
1913 - Webster's Revised Unabridged Dictionary
By Noah Webster.