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 he had been prescribed an antacid to prevent gastric ulcers. —Michael Ruiz , Julia Bonavita, FOXNews.com, 16 May 2025

To prevent this, drop an antacid in the soil once monthly. —Heather Bien, Southern Living, 10 May 2025

Magnesium-Containing Antacids and ADHD Drugs Magnesium carbonate is an ingredient in some antacids. —Lindsay Cook, Verywell Health, 28 Apr. 2025

For those experiencing unexplained upper abdominal pain, doctors recommend seeking medical advice instead of self-medicating with antacids. —Jonathan Granoff, Newsweek, 29 Jan. 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