Correct spelling for the English word "pentaginous" is [pɛntˈad͡ʒɪnəs], [pɛntˈadʒɪnəs], [p_ɛ_n_t_ˈa_dʒ_ɪ_n_ə_s] (IPA phonetic alphabet).
Having five pistils or styles.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.