Thymine (T): Is defined as one member of the base pair A-T (adenine-thymine) in DNA, according to multiple medical dictionaries for medicine. This is one of the best definitions for Thymine.
Each base pair is said to form a “rung of the DNA ladder.” A DNA nucleotide is made of a molecule of sugar, a molecule of phosphoric acid, and a molecule called a base. The bases are the “letters” that spell out the genetic code. In DNA, the code letters are A, T, G, and C, which stand for the chemicals adenine, thymine, guanine, and cytosine, respectively. In DNA base pairing, adenine always pairs with thymine, and guanine always pairs with cytosine.