Counteracting or neutralizing acidity, especially of the stomach.(adjective)
A substance, such as magnesia or sodium bicarbonate, that neutralizes acid.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "antacid" in a sentence
"They're called antacid - type medications, to basically thwart the effects, if you will, of some of these anti-inflammatories."
"As much as we'd like to try unique flavors, cake with garlicky marinara sounds like it's screaming for antacid ... or a tongue transplant."
"If you'd let me call my doctor he would have told you I had a hiatal hernia and I need an antacid—or better yet, a Nexium."