antiacid

from WordNet (r) 3.0 (2006)

antiacid
    n 1: an agent that counteracts or neutralizes acidity
         (especially in the stomach) [syn: {antacid}, {gastric
         antacid}, {alkalizer}, {alkaliser}, {antiacid}]

from The Collaborative International Dictionary of English v.0.48

antacid \ant*ac"id\ ([a^]nt*[a^]s"[i^]d), antiacid
\an*ti*ac"id\([a^]n*t[-e]*[a^]s"[i^]d), n. [Pref. anti- + acid.]
   (Med.)
   A remedy for neutralizing acidity, especially of the stomach,
   as an alkali or absorbent. -- a. Counteractive of acidity.
   [1913 Webster + AS]