hydrogen ion

noun

Used other than figuratively or idiomatically: see hydrogen, ion.: H⁻ or H⁺

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Meanings

nounhydrogen ion (plural hydrogen ions)

plural hydrogen ions

  1. chemistryUsed other than figuratively or idiomatically: see hydrogen, ion.: H⁻ or H⁺
  2. chemistrya proton combined with one or more water molecules; usually written H₃O⁺ and called the hydronium ion though is best considered as H₉O₄⁺ but is often written H⁺_((aq)) for simplicity
  3. chemistrya bare hydrogen nucleus; a proton, deuteron or triton
Cite this entry
APA

hydrogen ion. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/hydrogen%20ion

MLA

“hydrogen ion.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/hydrogen%20ion. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “hydrogen ion,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/hydrogen%20ion.

Source: hydrogen ion on Wiktionary, CC BY-SA 4.0.