Pronunciation: [ˈɒsɪɹˌuː] (IPA)
Correct spelling for the English word "OSIRRU" is [ˈɒsɪɹˌuː], [ˈɒsɪɹˌuː], [ˈɒ_s_ɪ_ɹ_ˌuː] (IPA phonetic alphabet).
Correct spelling for OSIRRU