oxalic acid

noun Chemistry.
a white, crystalline, water-soluble, poisonous acid, H 2 C 2 O 4 ⋅2H 2 O, first discovered in the juice of the wood sorrel species of oxalis and obtained by reacting carbon monoxide with sodium hydroxide or certain carbohydrates with acids or alkalis: used chiefly for bleaching, as a cleanser, and as a laboratory reagent.

Origin:
1785–95

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World English Dictionary
oxalic acid (ɒkˈsælɪk)
 
n
Systematic name: ethanedioic acid a colourless poisonous crystalline dicarboxylic acid found in many plants: used as a bleach and a cleansing agent for metals. Formula: (COOH)2
 
[C18: from French oxalique, from Latin oxalis garden sorrel; see oxalis]

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American Heritage
Medical Dictionary

oxalic acid ox·al·ic acid (ŏk-sāl'ĭk)
n.
A poisonous crystalline organic acid found in many plants and used as an agent in chemical reduction.

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
oxalic acid   (ŏk-sāl'ĭk)  Pronunciation Key 
A poisonous, crystalline acid found in a number of plants such as sorrel and the leaf blades of rhubarb. It is used for many industrial purposes, including rust removal and bleaching. Chemical formula: C2H2O4.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Oxalic acid interferes with the essential minerals iron, magnesium and especially calcium.
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