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 suddenly a sequence of songs that has been dealing with romantic ennui gets a knife-turn-in-the-gut twist that no amount of antacids will make feel better. —Chris Willman, Variety, 12 June 2026

From tucking antacids into the soil before planting to companion planting with marigolds, gardeners have lots of tips for helping tomato plants grow better. —Lauren Landers, The Spruce, 9 June 2026

Night sweats, sleepless nights, brain fog; the search for relief has driven some to get creative in the drugstore aisle, combining daily antihistamines like Allegra or Claritin with antacids like Pepcid AC. —Helen Carefoot, Flow Space, 29 May 2026

Magnesium is also used in some over-the-counter (OTC) medications, such as laxatives (Milk of Magnesia) or antacids (Rolaids or Tums). —Jennifer Lefton, Verywell Health, 28 May 2026

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