It is called adiabatic or an adiabatic process.

As I recall from flight school, the adiabatic lapse rate is 4.5oF per 1000 feet.

adiabatic

I'll assume the last word was 'process'. Adiabatic processes are those that proceed without the temperature changing, whilst the pressure and volume do change. For practical purposes, sound waves passing through the air are adiabatic.

The rate at which adiabatic cooling occurs with increasing altitude for wet air (air containing clouds or other visible forms of moisture) is called the wet adiabatic lapse rate, the moist adiabatic lapse rate, or the saturated adiabatic lapse rate.