nitrous oxide

noun

Definition of nitrous oxide

  1. :  a colorless gas N2O that when inhaled produces loss of sensibility to pain preceded by exhilaration and sometimes laughter, that is used especially as an anesthetic in dentistry and as a fuel, and that is an atmospheric pollutant and greenhouse gas produced by combustion —called also laughing gas

1798

First Known Use of nitrous oxide

1798


NITROUS OXIDE Defined for English Language Learners

nitrous oxide

noun

Definition of nitrous oxide for English Language Learners

  • : a gas that is used by dentists to keep patients from feeling pain


Medical Dictionary

nitrous oxide

noun

Medical Definition of nitrous oxide

  1. :  a colorless gas N2O that when inhaled produces loss of sensibility to pain preceded by exhilaration and sometimes laughter and is used especially as an anesthetic in dentistry—called also laughing gas


Learn More about nitrous oxide


Seen and Heard

What made you want to look up nitrous oxide? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

a Mesopotamian temple tower

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

  • alphabet-magnets
  • Which is the correct spelling?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ