nitrous acid

noun Chemistry.
an acid, HNO 2 , known only in solution.

Origin:
1670–80

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World English Dictionary
nitrous acid
 
n
Systematic name: dioxonitric(III) acid a weak monobasic acid known only in solution and in the form of nitrite salts. Formula: HNO2

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

nitrous acid n.
A weak inorganic acid existing only in solution or in the form of its salts.

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
nitrous acid  
A weak inorganic acid existing only in solution or in the form of its salts. It can act either as an oxidizing agent or as a reducing agent. Chemical formula: HNO2.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

nitrous acid

(HNO2), an unstable, weakly acidic compound that has been prepared only in the form of cold, dilute solutions. It is useful in chemistry in converting amines into diazonium compounds, which are used in making azo dyes. It is usually prepared by acidifying a solution of one of its salts, the nitrites, which are more stable (see nitrite).

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
One of these reasons is the lack of a mechanism to produce nitrous acid at night.
Other oxides of nitrogen including nitrous acid and nitric acid are part of the nitrogen oxide family.
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