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antacid

[ant-as-id]
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adjective
  1. preventing, neutralizing, or counteracting acidity, as of the stomach.
noun
  1. an antacid agent.

Origin of antacid

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

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British Dictionary definitions for antacid

antacid

noun
  1. a substance used to neutralize acidity, esp in the stomach
adjective
  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

antacid

(ănt-ăsĭd)
adj.
  1. Counteracting or neutralizing acidity, especially of the stomach.
n.
  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.