NCI Dictionary of Cancer Terms
The NCI Dictionary of Cancer Terms features 8,054 terms related to cancer and medicine.
- listen (py-RIH-mih-deen)
- One of two chemical compounds that cells use to make the building blocks of DNA and RNA. Examples of pyrimidines are cytosine, thymine, and uracil. Cytosine and thymine are used to make DNA and cytosine and uracil are used to make RNA.