nitrous oxide

noun Chemistry, Pharmacology.
a colorless, sweet-smelling, sweet-tasting, nonflammable, slightly water-soluble gas, N 2 O, that sometimes produces a feeling of exhilaration when inhaled: used chiefly as an anesthetic in dentistry and surgery, in the manufacture of chemicals, and as an aerosol.
Also called laughing gas.


Origin:
1790–1800

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World English Dictionary
nitrous oxide
 
n
Systematic name: dinitrogen oxide, Also called: laughing gas a colourless nonflammable slightly soluble gas with a sweet smell: used as an anaesthetic in dentistry and surgery. Formula: N2O

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

nitrous oxide n.
A colorless sweet-tasting gas used as a mild anesthetic in dentistry and surgery.

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 oxide  
A colorless, sweet-smelling gas. It is used as a mild anesthetic, often called laughing gas. Nitrous oxide occurs naturally in the atmosphere and is a greenhouse gas. Chemical formula: N2O.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
It is then converted to nitrous oxide which adds to global warming.
To top it off, oceanic nitrogen is converted to nitrous oxide, a greenhouse gas.
Flatus and manure from animals contain not only methane, but also nitrous oxide, an even more potent warming agent.
Nitrous oxide's chemical characteristics and interactions in the atmosphere contribute to its significance as a greenhouse gas.
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