antacid Meaning, Definition & Usage

  1. noun an agent that counteracts or neutralizes acidity (especially in the stomach)
    alkaliser; alkalizer; gastric antacid; antiacid.
  2. adjective satellite acting to neutralize acid (especially in the stomach)

WordNet

Ant*ac"id noun
Etymology
Pref. anti- + acid.
Definitions
  1. (Med.) A remedy for acidity of the stomach, as an alkali or absorbent. -- a. Counteractive of acidity.

Webster 1913