Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun Nitrous oxide, especially as used as an anesthetic.

from The Century Dictionary.

  • noun Nitrous oxid, or monoxid (N2O): so called because when inhaled it usually produces exhilaration, which is followed by insensibility.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun A common name for nitrous oxide used as an anaesthetic.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun inhalation anesthetic used as an anesthetic in dentistry and surgery

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

From its euphoric effects.

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