RHOMBOIDAL

\ɹˈɒmbɔ͡ɪdə͡l], \ɹˈɒmbɔ‍ɪdə‍l], \ɹ_ˈɒ_m_b_ɔɪ_d_əl]\
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1899 - The american dictionary of the english language.
By Daniel Lyons