Gas definition

găs
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.
noun
5
2
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.

An example of gas is helium.

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

noun
4
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.
noun
4
1
(slang) Someone or something exceptionally exciting or entertaining.

The party was a gas.

noun
3
0
The definition of gas is to expose someone to gas fumes, to treat chemically with gas or to give off gas fumes.

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.

verb
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(slang) Idle or boastful talk.
noun
2
0
A substance in the gaseous state.
noun
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0
Flatulence.
noun
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0
Flatus.
noun
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0
(mining) A mixture of firedamp with air, that explodes if ignited.
noun
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0
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A gaseous substance formed in the bowels, stomach, etc. during digestion.
noun
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0
A condition resulting from indigestion in which such gas causes abdominal bloating, flatulence, etc.
noun
2
0
Idle or boastful talk.
noun
2
0
Something or someone that is very pleasing, exciting, amusing, etc.

The movie was a gas.

noun
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0
A gaseous anesthetic, such as nitrous oxide.
noun
2
0
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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.
noun
2
0
A substance in the gaseous state.
noun
2
0
Flatulence.
noun
2
0
Flatus.
noun
2
0
(uncountable, chemistry) Matter in a state intermediate between liquid and plasma that can be contained only if it is fully surrounded by a solid (in a bubble of liquid) (held together by gravitational pull); it can condense into a liquid, or can (rarely) become a solid directly.

A lot of gas had escaped from the cylinder.

noun
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(countable, chemistry) A chemical element or compound in such a state.

The atmosphere is made up of a number of different gases.

noun
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(uncountable) A flammable gaseous hydrocarbon or hydrocarbon mixture (typically predominantly methane) used as a fuel, e.g. for cooking, heating, electricity generation or as a fuel in internal combustion engines in vehicles.

Gas-fired power stations have largely replaced coal-burning ones.

noun
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(countable) A hob on a gas cooker.

She turned the gas on, put the potatoes on, then lit the oven.

noun
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(US) Methane or other waste gases trapped in one's belly as a result of the digestive process.

My tummy hurts so bad, I have gas.

noun
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(slang) A humorous or entertaining event or person.

He is such a gas!

noun
2
0
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(baseball) A fastball.

The closer threw him nothing but gas.

noun
2
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To kill with poisonous gas.
verb
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To talk, chat.
verb
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0
To emit gas.

The battery cell was gassing.

verb
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0
(uncountable, US) Gasoline; a derivative of petroleum used as fuel.
noun
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(US) Gas pedal.
noun
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0
(US) To give a vehicle more fuel in order to accelerate it.

The cops are coming. Gas it!

verb
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(US) To fill (a vehicle's fuel tank) with fuel.
verb
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(Ireland, colloquial) Comical, zany.

Mary's new boyfriend is a gas man.

It was gas when the bird flew into the classroom.

adjective
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Plural form of äga.
noun
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To treat chemically with gas.
verb
3
2
Any substance, as phosgene, intentionally dispersed through the atmosphere, as in war, to act as a poison, irritant, or asphyxiant.
noun
3
2
The speed control of a gasoline engine. Used with the:

Step on the gas.

noun
2
1
A gaseous asphyxiant, irritant, or poison.
noun
2
1
To overcome, disable, or kill with poisonous fumes.
verb
2
1
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(slang) To talk excessively.
verb
2
1
Any mixture of flammable gases used for lighting, heating, or cooking.
noun
2
1
Any gas, as nitrous oxide, used as an anesthetic.
noun
2
1
noun
2
1
(informal) Energy, power, force, drive, etc.

By game's end, the players had run out of gas.

noun
2
1
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To supply with gas.
verb
2
1
To subject to the action of gas.
verb
2
1
To injure or kill by gas, as in war.
verb
2
1
(slang) To thrill, delight, amuse greatly, etc.
verb
2
1
To give off gas.
verb
2
1
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(slang) To talk in an idle or boastful way.
verb
2
1
Of, using, or operated by gas.
adjective
2
1
A gaseous asphyxiant, irritant, or poison.
noun
2
1
To treat chemically with gas.
verb
2
1
To overcome, disable, or kill with poisonous fumes.
verb
2
1
One of four main states of matter , composed of molecules in constant random motion. Unlike a solid, a gas has no fixed shape and will take on the shape of the space available. Unlike a liquid, the intermolecular forces are very small; it has no fixed volume and will expand to fill the space available.
2
1
2
1
To give off gas.
verb
3
3
Any gaseous substance formed by decaying or decomposing matter.
noun
2
2
A gaseous anesthetic, such as nitrous oxide.
noun
6
7
Gasoline.
noun
5
7
A gaseous fuel, such as natural gas.
noun
5
9
gas up
  • to put gasoline into the tank of (a vehicle)
idiom
2
0
step on the gas
  • to press on the accelerator of an automobile
  • to hurry; move or act faster
idiom
2
0

Other Word Forms

Noun

Singular:
gas
Plural:
gases

Idioms and Phrasal Verbs

Origin of gas

  • Dutch an occult physical principle supposed to be present in all bodies alteration of Greek khaos chaos, empty space coined by Jan Baptista van Helmont (1577–1644), Flemish chemist

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Dutch gas, a word coined by chemist Van Helmont. From Ancient Greek χάος (khaos, “chasm, void”).

    From Wiktionary

  • Compare the slang usage of "a gas", above.

    From Wiktionary

  • Shortening of gasoline.

    From Wiktionary