[bahy-kahr-buh-nit, -neyt]
noun Chemistry.
a salt of carbonic acid, containing the HCO 3 −1 group; an acid carbonate, as sodium bicarbonate, NaHCO 3 .

1810–20; bi-1 + carbonate Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
bicarbonate (baɪˈkɑːbənɪt, -ˌneɪt)
1.  a salt of carbonic acid containing the ion HCO3--; an acid carbonate
2.  (modifier) Systematic name: hydrogen carbonate consisting of, containing, or concerned with the ion HCO3--: a bicarbonate compound
3.  short for bicarbonate of soda

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

1819, from bi- + carbonate.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

bicarbonate bi·car·bon·ate (bī-kär'bə-nāt', -nĭt)
The radical group HCO3 or a compound, such as sodium bicarbonate, containing it.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
bicarbonate   (bī-kär'bə-nāt')  Pronunciation Key 
The group HCO3 or a compound containing it, such as sodium bicarbonate. When heated, bicarbonates give off carbon dioxide.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Ocean acidification has further chemical implications: more hydrogen ions mean
  more bicarbonate ions, and fewer carbonate ions.
The importance of using sodium bicarbonate to normalize body pH should not be
  overlooked either.
Metabolic alkalosis is caused by too much bicarbonate in the blood.
They may also stimulate the defensive systems in the stomach by increasing
  bicarbonate and mucous secretion.
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