Correct spelling for the English word "otosis" is [ɒtˈə͡ʊsɪs], [ɒtˈəʊsɪs], [ɒ_t_ˈəʊ_s_ɪ_s] (IPA phonetic alphabet).
Hearing erroneously and so receiving a false impression or repeating incorrectly.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.