hydrochloric acid

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hydrochloric acid (countable and uncountable, plural hydrochloric acids)

  1. (inorganic chemistry) A strong acid made by dissolving the gas hydrogen chloride in water. It reacts with alkalis, bases and many metals to form chlorides; it has many industrial applications.
    Synonyms: (when used as an acidity regulator) E507, muriatic acid, spirit of salt, spirits of salts, swimming pool acid
    • 1880, William Blades, The Enemies of Books, page 92:
      If not sufficiently purified, a little hydrochloric or oxalic acid, or caustic potash may be put in the water, according as the stains are from grease or from ink.