acidulous

from WordNet (r) 3.0 (2006)

acidulous
    adj 1: being sour to the taste [syn: {acidic}, {acid},
           {acidulent}, {acidulous}]

from The Collaborative International Dictionary of English v.0.48

Acidulous \A*cid"u*lous\, a. [L. acidulus, dim. of acidus. See
   Acid.]
   Slightly sour; sub-acid; sourish; as, an acidulous tincture.
   --E. Burke.
   [1913 Webster]

   {Acidulous mineral waters}, such as contain carbonic
      anhydride.
      [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

64 Moby Thesaurus words for "acidulous":
      acerb, acerbate, acerbic, acetic, acetose, acetous, acid, acidic,
      acidulated, acidulent, acrid, acrimonious, astringent, biting,
      bitter, burning, caustic, choleric, corroding, corrosive, cutting,
      double-edged, dry, edged, embittered, escharotic, fierce, harsh,
      hyperacid, incisive, keen, mordacious, mordant, penetrating,
      piercing, piquant, poignant, pungent, rancorous, rankled,
      resentful, resenting, rigorous, rough, scathing, scorching, severe,
      sharp, sore, splenetic, stabbing, stewing, stinging, strident,
      stringent, subacid, subacidulous, tart, trenchant, vehement,
      violent, virulent, vitriolic, withering