Pseudoadiabatic expansion

From Glossary of Meteorology

pseudoadiabatic expansion

A saturation-adiabatic process in which the condensed water substance is removed from the system, and therefore best treated by the thermodynamics of open systems.

Meteorologically, this process corresponds to rising air from which the moisture is precipitating. Descent of air so lifted becomes by definition a dry-adiabatic process.
See pseudoadiabatic process.