Standard Lemma guide

tautomerism

noun · 1 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

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1

noun

Meaning 1

A form of isomerism in which a dynamic equilibrium between multiple isomers exists, such as that between an enol and a ketone.

Definition source: English Wiktionary via Wiktextract

Usage: countable, uncountable

Topics: chemistry, natural-sciences, organic-chemistry, physical-sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

History

Etymology

Etymology tree English tautomer Proto-Indo-European *-id- Proto-Indo-European *-yéti Proto-Indo-European *-idyéti Proto-Hellenic *-íďďō Ancient Greek -ῐ́ζω (-ĭ́zō) Proto-Indo-European *-mos Proto-Indo-European *-mós Ancient Greek -μός (-mós) Ancient Greek -ισμός (-ismós)der. English -ism English tautomerism From tautomer + -ism.

Across languages

Translations

6 source translations are retained for this English entry.

  • Chinese Mandarin: 互變異構 /互变异构 (hùbiànyìgòu) — isomerism with a dynamic equilibrium
  • Finnish: tautomeria — isomerism with a dynamic equilibrium
  • Greek: ταυτομερισμός (taftomerismós) — isomerism with a dynamic equilibrium
  • Irish: tátaiméireacht — isomerism with a dynamic equilibrium
  • Japanese: 互変異性 (gohen'isei) — isomerism with a dynamic equilibrium
  • Russian: таутомери́я (tautomeríja) — isomerism with a dynamic equilibrium