Hypertext Webster Gateway: "Adiabatic"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Adiabatic \Ad`i*a*bat"ic\, a. [Gr. ? not passable; 'a priv. + ?
through + ? to go.] (Physics)
Not giving out or receiving heat. -- {Ad`i*a*bat`ic*al*ly},
adv.
{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.
From WordNet (r) 1.7 (wn)
adiabatic
adj : (physics) occurring without loss or gain of heat; "adiabatic
expansion" [ant: {diabatic}]
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