antacid

[ant-as-id]
adjective
1.
preventing, neutralizing, or counteracting acidity, as of the stomach.
noun
2.
an antacid agent.

Origin:
1725–35; ant- + acid

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World English Dictionary
antacid (æntˈæsɪd)
 
n
1.  a substance used to neutralize acidity, esp in the stomach
 
adj
2.  having the properties of this substance: antacid tablets

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

antacid
1732, medical hybrid from anti- + acid.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

antacid ant·ac·id (ānt-ās'ĭd) or an·ti·ac·id (ān'tē-ās'ĭd, ān'tī-)
adj.
Counteracting or neutralizing acidity, especially of the stomach. n.
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.
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Example sentences
More than any other denizens of the cosmos, comets cause astronomers to gobble down antacid tablets.
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