Pronunciation: [ˌɪntəpˈa͡ɪəl] (IPA)
Correct spelling for the English word "interpial" is [ˌɪntəpˈa͡ɪəl], [ˌɪntəpˈaɪəl], [ˌɪ_n_t_ə_p_ˈaɪ_ə_l] (IPA phonetic alphabet).
In the pia mater.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.
Correct spelling for interpial