antacid

noun

ant·​ac·​id (ˌ)ant-ˈa-səd 

ˈant-ˌa-

: an agent that counteracts or neutralizes acidity

antacid adjective

Examples of antacid in a Sentence

Recent Examples on the Web

Don’t bother adding eggshells, antacids, etc. to the soil. —Nan Sterman, San Diego Union-Tribune, 2 Aug. 2025

These include pain relievers, fungal cream, iron pills and antacids. —Nicole Villalpando, Austin American Statesman, 2 July 2025

Because magnesium carbonate and hydroxide can be used in antacids, drug interactions with methylphenidate are possible. —Lindsay Cook, Verywell Health, 28 Apr. 2025

And besides vaccines, other health products such as antacids, buffered aspirin and antiperspirants contain aluminum. —Joshua P. Cohen, Forbes.com, 1 Aug. 2025

Word History

First Known Use

1699, in the meaning defined above

Rhymes for antacid

• acid
• placid

Kids Definition

antacid

adjective

ant·​ac·​id (ˈ)ant-ˈas-əd 

: tending to prevent or neutralize acidity

antacid tablets

antacid noun

Medical Definition

antacid

1 of 2 adjective

ant·​ac·​id (ˈ)ant-ˈas-əd 

variants also antiacid

ˌant-ē-ˈas-əd, ˌan-ˌtī- 

: tending to counteract acidity

antacid

2 of 2 noun

variants also antiacid

: an agent (as an alkali or absorbent) that counteracts or neutralizes acidity