Nitrous oxide
WordNet
noun
(1) Inhalation anesthetic used as an anesthetic in dentistry and surgery
WiktionaryText
Noun
- A non-flammable gas (N2O) commonly used in surgery and dentistry for its anaesthetic and analgesic effects.
Synonyms
- dinitrogen oxide, dinitrogen monoxide, laughing gas
- E942 when used as a propellant