Pronunciation: [ˈɛktə͡ʊntə͡l] (IPA)
Correct spelling for the English word "ectoental" is [ˈɛktə͡ʊntə͡l], [ˈɛktəʊntəl], [ˈɛ_k_t_əʊ_n_t_əl] (IPA phonetic alphabet).
Ectental.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.
Correct spelling for ectoental