adiabat

noun
adi·a·bat | \ˈa-dē-ə-ˌbat\
variants: or less commonly adiabatic \ˌa-dē-ə-ˈba-tik, 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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First Known Use of adiabat

1872, in the meaning defined above

History and Etymology for adiabat

adiabat, back-formation from adiabatic, adjective; adiabatic, from adiabatic, adjective

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The first known use of adiabat was in 1872

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