Definition of acid noun from the Oxford Advanced American Dictionary

  

acid

 noun
noun
NAmE//ˈæsɪd//
 
[uncountable, countable](chemistry)
 
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a chemical, usually a liquid, that contains hydrogen and has a pH of less than seven. The hydrogen can be replaced by a metal to form a salt. Acids are usually sour and can often burn holes in or damage things they touch. compare alkali see also acetic acid, amino acid, ascorbic acid, citric acid, hydrochloric acid, lactic acid, nitric acid, nucleic acid, sulfuric acid
See the Oxford Advanced Learner's Dictionary entry: acid