gas medical definition

noun pl. gas·es or gas·ses

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.
A substance in the gaseous state.
A gaseous fuel, such as natural gas.
Gasoline.
A gaseous asphyxiant, an irritant, or a poison.
A gaseous anesthetic, such as nitrous oxide.
Flatulence.
Flatus.

verb