Recent Examples on the WebSuch an altered base pair, known as a tautomer, can quickly jump back to its original arrangement. Lars Fischer, Scientific American, 18 Aug. 2022 Called a tautomer, the drug assumes two forms, one which closely resembles uracil (U) and the other cytosine (C). William A. Haseltine, Forbes, 8 Oct. 2021
Word History
Etymology
International Scientific Vocabulary, from tautomeric