adiabatic, a. [Gr. not passable; 'a priv. + through + to go.].
Not giving out or receiving heat. [
Webster 1913 Suppl.]
"The adiabatic expansion of carbon dioxide from a compressed container causes the temperature of the gas to decrease rapidly below its freezing point, resulting in the familiar carbon dioxide “snow” emitted by carbon dioxide fire extinguishers."
[PJC.]
Adiabatic line or curve, a curve exhibiting the variations of pressure and volume of a fluid when it expands without either receiving or giving out heat. Rankine.