citric acid

noun
a white, crystalline, water-soluble powder, C 6 H 8 O 7 ⋅H 2 O, a tribasic acid having a strong acidic taste, an intermediate in the metabolism of carbohydrates occurring in many fruits, especially limes and lemons, obtained chiefly by fermentation of crude sugar or corn sugar: used chiefly in the flavoring of beverages, confections, and pharmaceuticals.

Origin:
1805–15

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Collins
World English Dictionary
citric acid
 
n
a water-soluble weak tribasic acid found in many fruits, esp citrus fruits, and used in pharmaceuticals and as a flavouring (E330). It is extracted from citrus fruits or made by fermenting molasses and is an intermediate in carbohydrate metabolism. Formula: CH2(COOH)C(OH)(COOH)CH2COOH

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

citric acid cit·ric acid (sĭt'rĭk)
n.
A colorless translucent crystalline acid principally derived by fermentation of carbohydrates; an intermediate in metabolism.

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
citric acid   (sĭt'rĭk)  Pronunciation Key 
A white, odorless acid that has a sour taste and occurs widely in plants, especially in citrus fruit, and is formed during the Krebs cycle. It is used in medicine and as a flavoring. Ions of citric acid are a by-product of the metabolism of carbohydrates during the Krebs cycle.Chemical formula: C6H8O7.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Some ingredients were benign, such as citric acid and instant coffee.
Citric acid rots you teeth so another penny for anything with citric acid in it.
We use citric acid, which is a much more natural flavor.
Then she brushes on sucrose to test my sense of sweet, citric acid to test
  sour, and quinine to test bitter.
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