see also: ACID
Pronunciation Adjective


  1. Sour, sharp, or biting to the taste; tart; having the taste of vinegar.
    acid fruits or liquors
  2. (figuratively) Sour-tempered.
    • 1864, Anthony Trollope, The Small House at Allington, Smith, Elder & Co., 2nd Edition, Volume 2, page 235 ↗,
      His voice was as stern and his face as acid as ever.
    • 1914, Louis Joseph Vance, chapter I, in Nobody, New York, N.Y.: George H[enry] Doran Company, published 1915, OCLC 40817384 ↗:
      Little disappointed, then, she turned attention to "Chat of the Social World," gossip which exercised potent fascination upon the girl's intelligence. She devoured with more avidity than she had her food those pretentiously phrased chronicles of the snobocracy […] distilling therefrom an acid envy that robbed her napoleon of all its savour.
  3. Of or pertaining to an acid; acidic.
  4. (music) Denoting a musical genre that is a distortion (as if hallucinogenic) of an existing genre, as in acid house, acid jazz, acid rock.
Synonyms Antonyms Translations Translations Translations Noun


  1. A sour substance.
  2. (chemistry) Any of several classes of compound having the following properties:
    1. 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.
    2. Any compound that easily donates protons; a Brønsted acid
    3. Any compound that can accept a pair of electrons to form a covalent bond; a Lewis acid
  3. (slang) lysergic acid diethylamide (LSD)
Antonyms Translations Translations Translations
  • French: acide
  • Italian: acido, acido lisergico
  • Portuguese: ácido
  • Russian: кислота́


acid (uncountable)

  1. (databases) Acronym of atomicity, consistency, isolation, and durability, a set of properties that guarantee database transactions are processed reliably

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