Usually means: Proton, often in aqueous solution.
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We found 19 dictionaries that define the word hydrogen ion:

General (13 matching dictionaries)
  1. hydrogen ion: Merriam-Webster
  2. hydrogen ion: American Heritage Dictionary of the English Language
  3. hydrogen ion: Collins English Dictionary
  4. hydrogen ion: Vocabulary.com
  5. hydrogen ion: Wiktionary
  6. hydrogen ion: The Wordsmyth English Dictionary-Thesaurus
  7. hydrogen ion: Infoplease Dictionary
  8. hydrogen ion: Dictionary.com
  9. Hydrogen ion: Wikipedia, the Free Encyclopedia
  10. hydrogen ion: Rhymezone
  11. hydrogen ion: FreeDictionary.org
  12. hydrogen ion: Mnemonic Dictionary
  13. hydrogen ion: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. hydrogen ion: Encyclopedia

Medicine (3 matching dictionaries)
  1. hydrogen ion: Merriam-Webster Medical Dictionary
  2. online medical dictionary (No longer online)
  3. Hydrogen-ion, hydrogen ion, hydrogen ion [H + ]: Medical dictionary

Tech (2 matching dictionaries)
  1. Glossary of Meteorology (No longer online)
  2. HYDROGEN ION: Power Engineering

(Note: See hydrogen_ions as well.)

Definitions from Wiktionary (hydrogen ion)

noun:  (chemistry) Used other than figuratively or idiomatically: see hydrogen, ion.: H⁻ or H⁺
noun:  (chemistry) a 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
noun:  (chemistry) a bare hydrogen nucleus; a proton, deuteron or triton

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