Noun

1. 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
2. A fluid in the gaseous state having neither independent shape nor volume and being able to expand indefinitely
3. A volatile flammable mixture of hydrocarbons (hexane and heptane and octane etc.) derived from petroleum; used mainly as a fuel in internal-combustion engines
4. A state of excessive gas in the alimentary canal
5. A pedal that controls the throttle valve
6. A fossil fuel in the gaseous state; used for cooking and heating homes

Verb

1. Attack with gas; subject to gas fumes
2. Show off