|—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]|
n. 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.
A gaseous asphyxiant, an irritant, or a poison.
A gaseous anesthetic, such as nitrous oxide.
To treat chemically with gas.
To overcome, disable, or kill with poisonous fumes.
To give off gas.
|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)
group A streptococci