THYMINE By N., Pam M.S. - April 29, 2013 noun. a pyrimidine compound which is one of the four bases located in DNA. With regard to RNA, uracil takes the place of thymine. THYMINE: "You will be expected to identify all the components of DNA chains, including thymine." Related Psychology Terms URACIL CYTOPLASMIC GUANINE PRECURSOR PHONOSURGERY OXIDATION PLURALISM CONFEDERATE ADENINE TOXIN Cite this page: N., Pam M.S., "THYMINE," in PsychologyDictionary.org, April 29, 2013, https://psychologydictionary.org/thymine/ (accessed April 19, 2021).