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.
The American Heritage® Stedman's Medical Dictionary
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