Correct spelling for the English word "retivenius" is [ɹˌɛtɪvˈiːnɪəs], [ɹˌɛtɪvˈiːnɪəs], [ɹ_ˌɛ_t_ɪ_v_ˈiː_n_ɪ__ə_s] (IPA phonetic alphabet).
In bot., having reticulated veins.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.