noun Chemistry.
the ability of certain organic compounds to react in isomeric structures that differ from each other in the position of a hydrogen atom and a double bond.

1880–85; tauto- + (iso)merism

tautomeric [taw-tuh-mer-ik] , adjective
nontautomeric, adjective
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World English Dictionary
tautomerism (tɔːˈtɒməˌrɪzəm)
See also keto-enol tautomerism the ability of certain chemical compounds to exist as a mixture of two interconvertible isomers in equilibrium
[C19: from tauto- + isomerism]

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American Heritage
Medical Dictionary

tautomerism tau·tom·er·ism (tô-tŏm'ə-rĭz'əm)
Chemical isomerism in which the isomeric forms differ little, usually only in the position of a hydrogen atom, and are able to exist in equilibrium and react with each other.

tau'to·mer'ic (tô'tə-měr'ĭk) adj.
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Example sentences for tautomeric
This is because a carbonyl is in tautomeric resonance with an enol.
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