Definition of acid adjective from the Oxford Advanced American Dictionary

     

    acid

     adjective
    adjective
    NAmE//ˈæsɪd//
     
     
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  1. 1 (technology) that contains acid or has the essential characteristics of an acid; that has a pH of less than seven Rye can grow in acid soil. compare alkaline
  2. 2 that has a bitter, sharp taste synonym sour acid fruit
  3. 3(of a person's remarks) critical and unkind synonym cutting synonym sarcastic an acid wit
See the Oxford Advanced Learner's Dictionary entry: acid