ura·cil /ˈjʊrəˌsɪl, səl/ 二氧嘧啶; 尿嘧啶
ura·cil /ˈjʊrəˌsɪl, səl/ 名詞 尿嘧啶,2,4一二氧嘧啶
uracil n : a nitrogen-containing base found in RNA (but not in DNA) and derived from pyrimidine; pairs with adenine [syn: U]