Pronunciation: [hɛlkˈə͡ʊsɪs] (IPA)
Correct spelling for the English word "helcosis" is [hɛlkˈə͡ʊsɪs], [hɛlkˈəʊsɪs], [h_ɛ_l_k_ˈəʊ_s_ɪ_s] (IPA phonetic alphabet).
Correct spelling for helcosis