Pronunciation: [ɪntɹˈiːtmənt] (IPA)
Correct spelling for the English word "intreatment" is [ɪntɹˈiːtmənt], [ɪntɹˈiːtmənt], [ɪ_n_t_ɹ_ˈiː_t_m_ə_n_t] (IPA phonetic alphabet).