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
   "The experiment required careful handling of the strong acid"
    
2. A corrosive liquid with a pH less than 7; a solution of in water of a substance that releases hydrogen ions
   "The chemist carefully added the acid to the solution"
    
3. [slang] Street name for lysergic acid diethylamide
   "The police report mentioned that acid was being sold at the concert";
   - back breaker [slang], battery-acid [slang], dose [slang], dot [slang], Elvis [slang], loony toons [slang], Lucy in the sky with diamonds [slang], pane [slang], superman [slang], window pane [slang]

1. (chemistry) having the characteristics of an acid
   "an acid reaction"
    
2. Being sour to the taste
   "They found a medium-sized red glossy fruit with a juicy and very acid pulp";
   - acidic, acidulent, acidulous
    
3. Harsh or corrosive in tone
   "a barrage of acid comments";
   - acerb, acerbic, acrid, bitter, blistering, caustic, sulfurous [N. Amer], sulphurous [Brit, Cdn], virulent, vitriolic, acidulous
    
4. (music, as a modifier) being a distortion (as if hallucinogenic) of an existing genre
   "acid house"
    
5. (geology) rich in silica
   "The volcanic eruption produced acid lava flows"

Derived forms: acids

See also: acidic, sour, unpleasant

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

Encyclopedia: Acid, Anthony