Definitions

1. noun

A substance that neutralizes or counteracts an acid, especially to relieve heartburn and indigestion.

“She took an antiacid tablet to ease her stomach pain after eating spicy food.”

2. adjective

Opposed to or counteracting an acid, especially in the action of neutralizing or reducing acidity.

“The antiacid properties of the medication helped to soothe her irritated esophagus.”