thymidine 2 topics · 2 sources Healthcare› MedicineCancerA chemical compound found in DNA. Also used as treatment for mucositis.National Cancer Institute — Dictionary of Cancer Terms Cite Science› Biotechnology and GeneticsFood BiotechnologyThe deoxyribonucleoside resulting from the combination of the base thymine (T) and the sugar 2-deoxy-D-ribose. See: TTP.UN Food and Agriculture Organization — Glossary of Biotechnology for Food and Agriculture Cite