acidic

from WordNet (r) 3.0 (2006)

acidic
    adj 1: being or containing an acid; of a solution having an
           excess of hydrogen atoms (having a pH of less than 7)
           [ant: {alkalic}, {alkaline}, {amphiprotic}, {amphoteric}]
    2: being sour to the taste [syn: {acidic}, {acid}, {acidulent},
       {acidulous}]

from The Collaborative International Dictionary of English v.0.48

Acidic \A*cid"ic\, a. (Min.)
   1. Containing a high percentage of silica; -- opposed to
      {basic}.
      [1913 Webster]

   2. of or relating to acid; having the character of an acid,
      as an acidic solution.
      [PJC]

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