acid in WordNet English dictionary

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"
   acerb  acerbic  acid  acrid  bitter  blistering  caustic  sulfurous  sulphurous  virulent  vitriolic 
   
2. having the characteristics of an acid
   "an acid reaction"
   acid 
   
3. being sour to the taste
   acidic  acid  acidulent  acidulous 
   

1. street name for lysergic acid diethylamide
   acid  back breaker  battery-acid  dose  dot  Elvis  loony toons  Lucy in the sky with diamonds  pane  superman  window pane  Zen 
   
2. 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
   acid