Pronunciation: [stɹˈa͡ɪe͡ɪtəst] (IPA)
Correct spelling for the English word "striatest" is [stɹˈa͡ɪe͡ɪtəst], [stɹˈaɪeɪtəst], [s_t_ɹ_ˈaɪ_eɪ_t_ə_s_t] (IPA phonetic alphabet).
Correct spelling for striatest