SUBTRAPEZOIDAL

\sʌbtɹˈapɪzˌɔ͡ɪdə͡l], \sʌbtɹˈapɪzˌɔ‍ɪdə‍l], \s_ʌ_b_t_ɹ_ˈa_p_ɪ_z_ˌɔɪ_d_əl]\
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1920 - A dictionary of scientific terms.
By Henderson, I. F.; Henderson, W. D.
 
1920 - A dictionary of scientific terms (6th edition)
By J.H. Kenneth