<p><strong>Noun</strong></p><ul><li>plural gases or gasses.</li><li>Physics: a substance possessing perfect molecular mobility and the property of indefinite expansion, as opposed to a solid or liquid.</li><li>any such fluid or mixture of fluids.</li><li>any such fluid used as an anesthetic, as nitrous oxide: Did the dentist give you gas for your extraction?</li><li>any such combustible fluid used as fuel: Light the gas in the oven.</li><li>Automotive: gasoline.</li><li>also called gas pedal: the foot-operated accelerator of an automotive vehicle: Take your foot off the gas.</li><li>flatus.</li><li>Coal Mining: an explosive mixture of firedamp with air.</li><li>an aeriform fluid or a mistlike assemblage of fine particles suspended in air, used in warfare to asphyxiate, poison, or stupefy an enemy.</li><li>Slang: empty talk.</li><li>a person or thing that is very entertaining, pleasing, or successful: The party was an absolute gas, and we loved it.</li><li>a person or thing that affects one strongly.</li></ul>