QUINTUPLE-RIBBED

\kwˈɪntuːpə͡lɹˈɪbd], \kwˈɪntuːpə‍lɹˈɪbd], \k_w_ˈɪ_n_t_uː_p_əl_ɹ_ˈɪ_b_d]\
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2010 - New Age Dictionary Database
By Oddity Software
 
1913 - Webster's Revised Unabridged Dictionary
By Noah Webster.