Webster's English Dictionary

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acid

Cross references:
  1. sour                  
 
1. ac.id \'as-*d\ aj [F or L; F acide, fr. L acidus, fr. ace-re to be sour 
   -]more at ACETIC 1a: sour, sharp, or biting to the taste  1b: sharp, 
   biting, or sour in manner, disposition, or nature  1c: sharply clear, 
   discerning, or pointed  2a: of, relating to, or being an acid; also : 
   having the reactions  or characteristics of an acid 2b: marked by excessive 
   or abnormal concentration of acid  3: relating to or made by a process (as 
   in making steel) in which the furnace is lined with acidic material and an 
   acidic slag is used 4: rich in silica  - ac.id.ly av
2. acid n : a sour substance; specif : any of various typically 
   water-solubl e and sour compounds capable of reacting with a base to form a 
   salt that are hydrogen-containing molecules or ions able to give up a 
   proton to a base or substances able to accept an unshared pair of electrons 
   from a base