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Copyright The Columbia University Press. thymine (thÄ«Â´mÄn), organic base of the pyrimidine family. Thymine was the first pyrimidine to be purified from a natural source, having been isolated from calf thymus and beef spleen in 1893â4. The accepted structure of the thymine molecule was published in 1900; this structure was confirmed when several investigators reported the synthesis of the compound during the period 1901 to 1910.
Definition of THYMINE. : a pyrimidine base C5H6N2O2 that is one of the four bases coding genetic information in the polynucleotide chain of DNA â compare adenine, cytosine, guanine, uracil.See thymine defined for kids. a pyrimidine base C5H6N2O2 that is one of the four bases coding genetic information in the polynucleotide chain of DNA â compare adenine, cytosine, guanine, uracil.