Adiabatic
Pronunciation : Ad`i*a*bat"ic
Part of Speech : a.
Etymology : [Gr. (Physics)
Definition : Defn: 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.
Source : Webster's Unabridged Dictionary, 1913