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  1. Acid | Definition, Examples, Types, Uses, & Facts

    WebJul 20, 1998 · Acid, any substance that in water solution tastes sour, changes the color of certain indicators (e.g., reddens blue litmus paper), …

  2. Acid Definition & Meaning - Merriam-Webster

  3. ACID Definition & Meaning | Dictionary.com

  4. ac·id
    noun
    1. a chemical substance that neutralizes alkalis, dissolves some metals, and turns litmus red; typically, a corrosive or sour-tasting liquid of this kind. Often contrasted with alkali and base.
      "traces of acid" · "rainwater is a very weak acid"
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