gas

nouns

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
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a fluid in the gaseous state having neither independent shape nor volume and being able to expand indefinitely
gas
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is a type of (narrower)
continuous amorphous matter that tends to flow and to conform to the outline of its container: a liquid or a gas
a volatile flammable mixture of hydrocarbons (hexane and heptane and octane etc.) derived from petroleum; used mainly as a fuel in internal-combustion engines
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a state of excessive gas in the alimentary canal
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a pedal that controls the throttle valve
"he stepped on the gas"
a fossil fuel in the gaseous state; used for cooking and heating homes
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verbs

attack with gas; subject to gas fumes
"The despot gassed the rebellious tribes"
gas
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is a type of (narrower)
launch an attack or assault on; begin hostilities or start warfare with
"Hitler attacked Poland on September 1, 1939 and started World War II"; "Serbian forces assailed Bosnian towns all week"