gas (gas) any elastic aeriform fluid in which the molecules are separated from one another and so have free paths.gas´eous
laughing gas
gas,
alveolar gas the gas in the alveoli of the lungs, where gaseous exchange with the capillary blood takes place.
blood gases the partial pressures of oxygen and carbon dioxide in blood; see under analysis.
coal gas a gas, poisonous because it contains carbon monoxide, produced by destructive distillation of coal; much used for domestic cooking.
laughing gas nitrous oxide.
tear gas one which produces severe lacrimation by irritating the conjunctivae.
laugh·ing gas (l f  ng)n. Nitrous oxide, especially as used as an anesthetic. |
laughing gas
[laf′ing]
Usage notes: informal.
nitrous oxide, a side effect of which is laughter or giggling when administered in low doses.
gas,
n a fluid with no definite volume or shape whose molecules are practically unrestricted by cohesive forces.
gas, laughing,
n See nitrous oxide.
gas, noble,
n a gas that will not oxidize; the inert gases (e.g., helium and neon).
gas, olefiant,
n a machine that uses ethylene oxide gas to sterilize objects that cannot withstand high temperatures, such as soft plastic and cloth.
laughing gas
nitrous oxide.
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