• Sour, sharp, or biting to the taste; tart; having the taste of vinegar.

    "acid fruits or liquors"

  • (music) Denoting a musical genre that is a distortion (as if hallucinogenic) of an existing genre, as in acid house, acid jazz, acid rock.
  • Of or pertaining to an acid; acidic.
  • (figuratively) Sour-tempered.


  • A sour substance.
  • Any compound that easily donates protons; a Brønsted acid
  • Any of a class of water-soluble compounds, having sour taste, that turn blue litmus red, and react with some metals to liberate hydrogen, and with bases to form salts.
  • (slang) lysergic acid diethylamide (LSD)
  • (chemistry) Any of several classes of compound having the following properties:-
  • Any compound that can accept a pair of electrons to form a covalent bond; a Lewis acid

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