Acidulated

from The Collaborative International Dictionary of English v.0.48

Acidulate \A*cid"u*late\, v. t. [imp. & p. p. {Acidulated}; p.
   pr. & vb. n. {Acidulating}.] [Cf. F. aciduler. See
   {Acidulous}.]
   To make sour or acid in a moderate degree; to sour somewhat.
   --Arbuthnot.
   [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

acidulated \acidulated\ adj.
   1. made slightly acidic
      [WordNet 1.5]