嘧啶 mìdìng pyrimidine Origin Definitions Defs Strokes Stroke Words Sentences Sents 胞嘧啶 bāomìdìng cytosine cytosine nucleotide (C, pairs with guanine G in DNA and RNA)尿嘧啶 niàomìdìng uracil uracil (U), a nucleotide base that pairs with adenine (A) in RNA胸腺嘧啶 xiōngxiànmìdìng thymine thymine (T, pairs with adenine A [[腺嘌呤|腺嘌呤|xian4 piao4 ling4]] in DNA)