Pronunciation: [bˌe͡ɪsɪnˈe͡ɪsɪəl] (IPA)
Correct spelling for the English word "basinasial" is [bˌe͡ɪsɪnˈe͡ɪsɪəl], [bˌeɪsɪnˈeɪsɪəl], [b_ˌeɪ_s_ɪ_n_ˈeɪ_s_ɪ__ə_l] (IPA phonetic alphabet).
Basinasal.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.
Correct spelling for basinasial