Pronunciation: [ɹˈa͡ʊndɪŋɡˌɒfs] (IPA)
Correct spelling for the English word "roundingoffs" is [ɹˈa͡ʊndɪŋɡˌɒfs], [ɹˈaʊndɪŋɡˌɒfs], [ɹ_ˈaʊ_n_d_ɪ_ŋ_ɡ_ˌɒ_f_s] (IPA phonetic alphabet).