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Definition of 'acid'


  1. any of various water-soluble compounds having a sour taste and capable of turning litmus red and reacting with a base to form a salt
  2. street name for lysergic acid diethylamide
       Synonyms: back breaker battery-acid dose dot Elvis loony toons Lucy in the sky with diamonds pane superman window pane Zen


  1. harsh or corrosive in tone; "an acerbic tone piercing otherwise flowery prose"; "a barrage of acid comments"; "her acrid remarks make her many enemies"; "bitter words"; "blistering criticism"; "caustic jokes about political assassination, talk-show hosts and medical ethics"; "a sulfurous denunciation"; "a vitriolic critique"
       Synonyms: acerb acerbic acrid bitter blistering caustic sulfurous sulphurous venomous virulent vitriolic
  2. being sour to the taste
       Synonyms: acidic acidulent acidulous
  3. having the characteristics of an acid; "an acid reaction"

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