noun \(ˌ)ant-ˈa-səd, ˈant-ˌa-\

: medicine that prevents or lessens the pain caused by having too much acid in your stomach

Full Definition of ANTACID

:  an agent that counteracts or neutralizes acidity
antacid adjective

First Known Use of ANTACID


Rhymes with ANTACID


noun    (Concise Encyclopedia)

Any substance, such as sodium bicarbonate, magnesium hydroxide, or aluminum hydroxide, used to relieve the discomfort caused by indigestion, gastritis, and several forms of ulcers. Antacids counteract or neutralize gastric acidity for up to three hours after a single dose. Antacids should be taken when gastric acidity is most likely to be increasing—namely, between one and three hours after each meal and at bedtime.


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