See more synonyms for antacid on
  1. an antacid agent.

Origin of antacid

First recorded in 1725–35; ant- + acid Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for antacid

soluble, salty, salt, antacid, acrid, alkali, bitter, caustic, alkalescent

Examples from the Web for antacid

Historical Examples of antacid

British Dictionary definitions for antacid


  1. a substance used to neutralize acidity, esp in the stomach
  1. having the properties of this substanceantacid tablets
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for antacid

1732, adjective and noun, medical hybrid from anti- + acid.

Online Etymology Dictionary, © 2010 Douglas Harper

antacid in Medicine


  1. Counteracting or neutralizing acidity, especially of the stomach.
  1. A substance, such as sodium bicarbonate, that neutralizes acid.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.