noun, plural gases or gasses.
Physics. a substance possessing perfect molecular mobility and the property of indefinite expansion, as opposed to a solid or liquid.
any such fluid or mixture of fluids.
any such fluid used as an anesthetic, as nitrous oxide: Did the dentist give you gas for your extraction?
any such combustible fluid used as fuel: Light the gas in the oven.
Also called gas pedal. the foot-operated accelerator of an automotive vehicle: Take your foot off the gas.
Coal Mining. an explosive mixture of firedamp with air.
an aeriform fluid or a mistlike assemblage of fine particles suspended in air, used in warfare to asphyxiate, poison, or stupefy an enemy.
empty talk.
a person or thing that is very entertaining, pleasing, or successful: The party was an absolute gas, and we loved it.
a person or thing that affects one strongly.
verb (used with object), gassed, gassing.
to supply with gas.
to overcome, poison, or asphyxiate with gas or fumes.
to singe (yarns or fabrics) with a gas flame to remove superfluous fibers.
to treat or impregnate with gas.
to talk nonsense or falsehood to.
to amuse or affect strongly: Her weird clothes really gas me.
verb (used without object), gassed, gassing.
to give off gas, as a storage battery being charged.
to indulge in idle, empty talk.
to become drunk (often followed by up ).
Verb phrases
gas up, to fill the gasoline tank of an automobile, truck, or other vehicle.
step on the gas, Informal. to increase the speed of one's movement or activity; hurry: We'd better step on the gas or we'll be late for the concert.

1650–60; coined by J. B. van Helmont (1577–1644), Flemish chemist; suggested by Greek cháos atmosphere

gasless, adjective
nongas, noun, plural nongases.

fluid, gas, liquid (see synonym study at liquid). Unabridged


a Kwa language of Ghana, spoken in Accra and vicinity. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To gas
World English Dictionary
the internet domain name for

the chemical symbol for

Ga or 2 (ɡɑː)
n , Ga, Gas, , Gãs
1.  a member of a Negroid people of W Africa living chiefly in S Ghana
2.  the language of this people, belonging to the Kwa branch of the Niger-Congo family
or 2

abbreviation for
1.  General Assembly (of the United Nations)
2.  general average
3.  Georgia

gas (ɡæs)
n , pl gases, gasses
1.  liquid Compare solid a substance in a physical state in which it does not resist change of shape and will expand indefinitely to fill any container. If very high pressure is applied a gas may become liquid or solid, otherwise its density tends towards that of the condensed phase
2.  any substance that is gaseous at room temperature and atmospheric pressure
3.  Compare vapour any gaseous substance that is above its critical temperature and therefore not liquefiable by pressure alone
4.  a.  coal gas See also natural gas a fossil fuel in the form of a gas, used as a source of domestic and industrial heat
 b.  (as modifier): a gas cooker; gas fire
5.  a gaseous anaesthetic, such as nitrous oxide
6.  mining firedamp or the explosive mixture of firedamp and air
7.  the usual US, Canadian, and New Zealand word for petrol See also gasoline
8.  informal step on the gas
 a.  to increase the speed of a motor vehicle; accelerate
 b.  to hurry
9.  a toxic or suffocating substance in suspension in air used against an enemy
10.  informal idle talk or boasting
11.  slang a delightful or successful person or thing: his latest record is a gas
12.  (US) an informal name for flatus
vb (foll by to) , gases, gasses, gases, gasses, gassing, gassed
13.  (tr) to provide or fill with gas
14.  (tr) to subject to gas fumes, esp so as to asphyxiate or render unconscious
15.  (intr) to give off gas, as in the charging of a battery
16.  (tr) (in textiles) to singe (fabric) with a flame from a gas burner to remove unwanted fibres
17.  informal to talk in an idle or boastful way (to a person)
18.  slang chiefly (US), (Canadian) (tr) to thrill or delight
[C17 (coined by J. B. van Helmont (1577--1644), Flemish chemist): modification of Greek khaos atmosphere]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
Word Origin & History

1658, from Du. gas, probably from Gk. khaos "empty space" (see chaos). The sound of Du. "g" is roughly equivalent to that of Gk. "kh." First used by Flem. chemist J.B. van Helmont (1577-1644), probably influenced by Paracelsus, who used khaos in occult sense of "proper elements
of spirits" or "ultra-rarified water," which was van Helmont's definition of gas. Modern scientific sense began 1779, focused on "combustible mix of vapors" (1794, originally coal gas); "anesthetic" (1894, originally nitrous oxide); and "poison gas" (1900). Meaning "intestinal vapors" is from 1882. Slang sense of "empty talk" is from 1847; slang meaning "something exciting or excellent" first attested 1953, from earlier hepster slang gasser in the same sense (1944). Gas also meant "fun, a joke" in Anglo-Irish and was used so by Joyce (1914). As short for gasoline (q.v.), it is Amer.Eng., first recorded 1905.
Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
American Heritage
Medical Dictionary

The symbol for the element gallium.

gas (gās)
n. pl. gas·es or gas·ses

  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.

  2. A substance in the gaseous state.

  3. A gaseous fuel, such as natural gas.

  4. Gasoline.

  5. A gaseous asphyxiant, an irritant, or a poison.

  6. A gaseous anesthetic, such as nitrous oxide.

  7. Flatulence.

  8. Flatus.

v. gassed, gas·sing, gas·es or gas·ses
  1. To treat chemically with gas.

  2. To overcome, disable, or kill with poisonous fumes.

  3. To give off gas.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Cite This Source
American Heritage
Science Dictionary
The symbol for gallium.
gas   (gās)  Pronunciation Key 
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.

gaseous adjective (gās'ē-əs, gāsh'əs)
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source
American Heritage
Cultural Dictionary

gas definition

In physics, one of the phases of matter. The atoms or molecules in gases are more widely spaced than in solids or liquids and suffer only occasional collisions with one another.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
Cite This Source
Computing Dictionary

gas definition

GNU assembler

The Free On-line Dictionary of Computing, © Denis Howe 2010
Cite This Source
American Heritage
Abbreviations & Acronyms
  1. go ahead

  2. Irish

  1. Galatians

  2. gallium

  1. general agent

  2. general anesthesia

  3. General Assembly

  4. general average

  5. Georgia

  6. go ahead (shortwave transmission)

  7. good afternoon (shortwave transmission)

group A streptococci
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
Cite This Source
American Heritage
Idioms & Phrases


In addition to the idiom beginning with gas, also see cook with gas; run out of steam (gas).

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
Cite This Source
Example sentences
Shale drilling has unlocked one of the largest reservoirs of natural gas in the
There's a whole lot of laughing gas in the atmosphere these days.
It helps increase the percolation rate of water, allows the proper gas exchange
  and alleviates organic buildup from clippings.
When not in use, the gas firepit can be covered with a slab of ipe wood, which
  converts it into a coffee table.
Copyright © 2014, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature