laughing gas

1835–45 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
laughing gas
another name for nitrous oxide

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

laughing gas laugh·ing gas (lāf'ĭng)
Nitrous oxide, especially as used as an anesthetic.

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
laughing gas   (lāf'ĭng)  Pronunciation Key 
Nitrous oxide used as a mild anesthetic.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Nitrous oxide is commonly known as laughing gas and has a variety of uses,
  including as an anesthetic by doctors and dentists.
In addition to laughing gas, scientists have their eyes on methane, the second
  largest contributor to climate change.
Also known as laughing gas or happy gas oil: noun: fossil fuel formed from the
  remains of marine plants and animals.
Also known as laughing gas or happy gas nutrient: noun: substance an organism
  needs for energy, growth, and life.
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