gas

(noun) the state of matter distinguished from the solid and liquid states by: relatively low density and viscosity; relatively great expansion and contraction with changes in pressure and temperature; the ability to diffuse readily; and the spontaneous tendency to become distributed uniformly throughout any container. Synonyms: gaseous state.

(noun) a fluid in the gaseous state having neither independent shape nor volume and being able to expand indefinitely.

(noun) a volatile flammable mixture of hydrocarbons (hexane and heptane and octane etc.) derived from petroleum; used mainly as a fuel in internal-combustion engines. Synonyms: gasoline, gasolene, petrol.

(noun) a state of excessive gas in the alimentary canal. Synonyms: flatulence, flatulency.

(noun) a pedal that controls the throttle valve. Synonyms: accelerator, accelerator pedal, gas pedal, throttle, gun. Examples: "He stepped on the gas."

(noun) a fossil fuel in the gaseous state; used for cooking and heating homes. Synonyms: natural gas.

(verb) attack with gas; subject to gas fumes. Examples: "The despot gassed the rebellious tribes."

(verb) show off. Synonyms: boast, tout, swash, shoot a line, brag, blow, bluster, vaunt, gasconade.