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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
   - 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
   "a barrage of acid comments"
   - acerb, acerbic, acrid, bitter, blistering, caustic, sulfurous [N. Amer], sulphurous [Brit, Cdn], virulent, vitriolic, sulphureous [Brit]
    
2. Being sour to the taste
   - acidic, acidulent, acidulous
    
3. Having the characteristics of an acid
   "an acid reaction"

Derived forms: acids

See also: acidic, acidify, acidity, acidulate, sour, unpleasant

Type of: chemical compound, compound, LSD, lysergic acid diethylamide

Encyclopedia: Acid