#1 gas n. [gaseous state] 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. wn
#2 gas n. a fluid in the gaseous state having neither independent shape nor volume and being able to expand indefinitely. wn
#3 gas n. [gasoline, gasolene, petrol] a volatile flammable mixture of hydrocarbons (hexane and heptane and octane etc.) derived from petroleum; used mainly as a fuel in internal-combustion engines. wn
#4 gas v. attack with gas; subject to gas fumes; "The despot gassed the rebellious tribes". wn
#5 gas n. [flatulence, flatulency] a state of excessive gas in the alimentary canal. wn
vizzz