International Scientific Vocabulary, from New Latin thymus
First Known Use: 1894
Medical Definition of THYMINE
: a pyrimidine base C5H6N2O2 that is one of the four bases coding genetic information in the polynucleotide chain of DNA—compare adenine, cytosine, guanine, uracil
Illustration of THYMINE
Organic compound of the pyrimidine family, often called a base, consisting of a ring containing both nitrogen and carbon atoms, and a methyl group. It occurs in combined form in many important biological molecules, particularly DNA (where its complementary base is adenine). It or its corresponding nucleoside or nucleotide may be prepared from DNA by selective techniques of hydrolysis.