1. (chemistry) being or containing an acid; of a solution having an excess of hydrogen atoms (having a pH of less than 7)
   "Lemon juice is acidic"; "The soil was too acidic for growing certain plants"
    
2. Being sour to the taste
   "They found a medium-sized red glossy fruit with a juicy and very acidic pulp";
   - acid, acidulent, acidulous
    
3. (geology) containing a high percentage of silica
   "The acidic rocks were primarily composed of quartz"

See also: acid, acid-forming, sour

Antonym: alkalic, amphiprotic

Encyclopedia: Acidic