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Adjective: acidic  u'si-dik
  1. (chemistry) being or containing an acid; of a solution having an excess of hydrogen atoms (having a pH of less than 7)
     
  2. Being sour to the taste
    - acid, acidulent, acidulous
     
  3. (geology) containing a high percentage of silica

See also: acid, acid-forming, sour

Antonym: alkaline, amphoteric

Encyclopedia: Acidic