Physics . a substance possessing perfect molecular mobility and the property of indefinite expansion, as opposed to a solid or liquid.

any such fluid or mixture of fluids.

any such fluid used as an anesthetic, as nitrous oxide

Did the dentist give you gas for your extraction?

any such combustible fluid used as fuel

Light the gas in the oven.

Automotive .

gasoline.

Also called gas pedal. the foot-operated accelerator of an automotive vehicle

Take your foot off the gas.

flatus.

Coal Mining . an explosive mixture of firedamp with air.

an aeriform fluid or a mistlike assemblage of fine particles suspended in air, used in warfare to asphyxiate, poison, or stupefy an enemy.

Slang .

empty talk.

a person or thing that is very entertaining, pleasing, or successful

The party was an absolute gas, and we loved it.

a person or thing that affects one strongly.

to supply with gas.

to overcome, poison, or asphyxiate with gas or fumes.

to singe (yarns or fabrics) with a gas flame to remove superfluous fibers.

to treat or impregnate with gas.

Slang .

to talk nonsense or falsehood to.

to amuse or affect strongly

Her weird clothes really gas me.

to give off gas, as a storage battery being charged.

Slang .

to indulge in idle, empty talk.

to become drunk (often fol. by up ). ?

gas up, to fill the gasoline tank of an automobile, truck, or other vehicle. ?

step on the gas

Informal . to increase the speed of one's movement or activity; hurry

We'd better step on the gas or we'll be late for the concert.

noun

liquid , solid

noun

effluvium , fumes , miasma , smoke , stream , vapor , volatile substancenotes:fluids include liquids and gases ; a liquid is a fluid with a fixed volume , and a gas is a fluid that can expand indefinitely , babble , blab , blabber , chat , chitchat , jabber , palaver , prate , prattle , small talk , absurdity , acetylene , ammonia , butane , carbon dioxide , carbon monoxide , cyanogen , ethane , ethene , ether , ethylene , fuel , helium , hydrogen , hydrogen sulfide , inert , ketene , krypton , laughing , marsh , methane , mustard , nitrous oxide , noble , oxygen , ozone , propane , radon , tear , xenon

verb

babble , blabber , chitchat , clack , jabber , palaver , prate , prattle , rattle , run on