Pronunciation: [pɛtˈɪlə͡ʊ] (IPA)
Correct spelling for the English word "petillo" is [pɛtˈɪlə͡ʊ], [pɛtˈɪləʊ], [p_ɛ_t_ˈɪ_l_əʊ] (IPA phonetic alphabet).