acidic acidic /əˈsɪdɪk/

adjective

1. (chemistry) being or containing an acid; of a solution having an excess of hydrogen atoms (having a pH of less than 7)  ( acidic )
   (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 , acidic , acidulent , acidulous )
   being sour to the taste