Standard Lemma guide

counterion

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

Any ion of opposite charge to another in a solution or other electrochemical system

Definition source: English Wiktionary via Wiktextract

Topics: chemistry, natural-sciences, physical-sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

History

Etymology

Etymology tree Proto-Indo-European *ḱe? Proto-Indo-European *ḱóm Proto-Italic *kom Proto-Italic *kom- Proto-Indo-European *-teros Proto-Italic *-teros Proto-Italic *komterosder. Proto-Italic *komterād Latin contrāder. Old French contre- Anglo-Norman countre-bor. Middle English counter- English counter- Proto-Indo-European *h1ey- Proto-Indo-European *h1éyti Proto-Hellenic *éimi Ancient Greek ἰόν (ión)der. English ion English counterion From counter- + ion.

Across languages

Translations

4 source translations are retained for this English entry.

  • Finnish: vastaioni — ion of opposite charge
  • French: contre-ion — ion of opposite charge
  • German: Gegenion — ion of opposite charge
  • Korean: 상대이온 (sangdaeion) — ion of opposite charge