Pronunciation: [takˈə͡ʊsɪs] (IPA)
Correct spelling for the English word "tacosis" is [takˈə͡ʊsɪs], [takˈəʊsɪs], [t_a_k_ˈəʊ_s_ɪ_s] (IPA phonetic alphabet).
Tecosis.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.