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

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

It is also found as an ingredient in some over-the-counter (OTC) medications, such as laxatives and antacids. —Jennifer Lefton, Verywell Health, 28 July 2025

Relieves Heartburn Calcium carbonate is an antacid, a type of medication that neutralizes stomach acid. —Merve Ceylan, Health, 21 May 2025

The brand has two other stock keeping units — an antacid, $10, a Tums alternative; and Bloat + Gas Relief, $10, a Gas-X alternative, which will also launch into Walmart — and there will be nine skus total with the flavor assortment. —Emily Burns, Footwear News, 6 May 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