adiabatic

• POS: Adjective, Noun
• HYPHEN: ad=i=a=bat=ic

CIDE DICTIONARY

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.

OXFORD DICTIONARY

adiabatic, adj. & n. Physics
--adj.
1 impassable to heat.
2 occurring without heat entering or leaving the system.
--n. a curve or formula for adiabatic phenomena.

Derivative

adiabatically adv.

Etymology

Gk adiabatos impassable (as A-(1), diabaino pass)