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Hydroxy can refer to:

  • In chemical nomenclature, the prefix "hydroxy-" shows the presence of a hydroxyl functional group (−OH)
  • An abbreviation for the medication hydroxyzine, which is commonly sold under the brand names Atarax, Ucerax, Serecid, and Vistaril
  • Hydroxy gas: A nickname for oxyhydrogen, a combination of hydrogen and oxygen gas produced from the electrolysis of water