胸腺 xiōngxiàn thymus Definitions Defs Origin Strokes Stroke Words Sentences Sents 胸腺嘧啶 xiōngxiànmìdìng thymine a pyrimidine nucleobase (T) that pairs with [[腺嘌呤|腺嘌呤|xian4 piao4 ling4]] in DNA