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gas

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The definition of gas is to expose someone to gas fumes, to treat chemically with gas or to give off gas fumes.

(verb)

An example of gas is when you give someone nitrous oxide.
An example of gas is when people are exposed to mustard gas in a war setting.
An example of gas is when a car exhaust gives off fumes into the air.

Gas is defined as an air-like substance that expands to fill the space it is in. It also refers to a substance used as fuel.

(noun)

An example of gas is helium.
An example of gas is the fuel you put in your car to get it to move.

See gas in Webster's New World College Dictionary

noun pl. gases or gasses

the fluid form of a substance in which it can expand indefinitely and completely fill its container; form that is neither liquid nor solid; vapor
any mixture of flammable gases used for lighting, heating, or cooking
any gas, as nitrous oxide, used as an anesthetic
any substance, as phosgene, intentionally dispersed through the atmosphere, as in war, to act as a poison, irritant, or asphyxiant
various gaseous substances formed by living or decaying matter, esp. if formed in the stomach, bowels, etc.
Informal gasoline
☆ Slang
1. idle or boastful talk
2. something or someone that is very pleasing, exciting, amusing, etc.: the movie was a gas
Mining a mixture of firedamp with air, that explodes if ignited

Origin: ModL, altered by Van Helmont (1577-1644), Belgian chemist (with g- pronounced, as in Du, as a voiced fricative) < Gr chaos, air (see chaos), term used by Paracelsus

transitive verb gassed, gassing

to supply with gas
to subject to the action of gas
to injure or kill by gas, as in war
☆ Slang to thrill, delight, amuse greatly, etc.

intransitive verb

to give off gas
☆ Slang to talk in an idle or boastful way

adjective

of, using, or operated by gas

See gas in American Heritage Dictionary 4

noun pl. gas·es or gas·ses

a. 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.
b. A substance in the gaseous state.
A gaseous fuel, such as natural gas.
Gasoline.
The speed control of a gasoline engine. Used with the: Step on the gas.
A gaseous asphyxiant, irritant, or poison.
A gaseous anesthetic, such as nitrous oxide.
a. Flatulence.
b. Flatus.
Slang Idle or boastful talk.
Slang Someone or something exceptionally exciting or entertaining: The party was a gas.