from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A colorless, sweet-tasting gas, N2O, used as a mild anesthetic in dentistry and surgery.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A non-flammable gas (N2O) commonly used in surgery and dentistry for its anaesthetic and analgesic effects.

from the GNU version of the Collaborative International Dictionary of English

  • adj. See Laughing gas.

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

  • n. inhalation anesthetic used as an anesthetic in dentistry and surgery


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