py.rim.i.dine
n.（名词）A crystalline organic base, C4H 4N 2, that is the parent substance of various biologically important derivatives. 嘧啶：一种晶状生物碱，C4H 4N 2，是多种生物性地重要衍生物的亲本物质 Any of several basic compounds derived from or structurally related to pyrimidine, especially the nucleic acid constituents uracil, cytosine, and thymine.嘧啶类：由嘧啶衍生出来或在结构上与嘧啶有关的一种基本混合物尤指核酸组成的尿嘧啶，胞嘧啶和胸腺嘧啶
来源：Alteration of pyridine pyridine的变化
