noun🔗ShareA diazine in which the two nitrogen atoms are in the meta- positions; it is the basis of three of the bases found in DNA and RNA: thymine, uracil and cytosine"In biology class, we learned that cytosine, thymine, and uracil, three important building blocks of DNA and RNA, are all types of pyrimidine bases. "biochemistrybiologychemistrycompoundChat with AIVocabulary GamePractice Reading