adiabat
noun
adi·a·bat
| \ ˈa-dē-ə-ˌbat\
variants:
or less commonly adiabatic \ ˌa-dē-ə-ˈba-tik 
, ˌā-ˌdī-ə- \
, ˌā-ˌdī-ə- \
plural -s
Definition of adiabat
: a curve or line plotted using coordinates selected to represent the pressure and volume or the temperature and entropy of matter during an adiabatic process
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