Chem. the property of some substances of being in a condition of equilibrium between two isomeric forms and of reacting readily to form either
Origin of tautomerismfrom tauto- + Classical Greek meros, a part + -ism
Chemical isomerism characterized by facile interconversion of isomeric forms in equilibrium, especially by migration of a hydrogen atom.
Origin of tautomerismtauto- (iso)merism
(countable and uncountable, plural tautomerisms)