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Definition of acid adjective from the Oxford Advanced American Dictionary

Oxford3000

acid

adjective
/ˈæsɪd/ acid pronunciation American
 
1 (technical) that contains acid or has the essential characteristics of an acid; that has a pH of less than sevenRye can grow in acid soil. compare alkaline2 that has a bitter, sharp taste synonym souracid fruit3 (of a person's remarks) critical and unkind synonym cutting synonym sarcastican acid wit