Adjective
Having equal entropy.
Source: Webster's dictionaryUnder a perfect gas model there is an elegant set of equations for determining thermodynamic state along a constant entropy stream line called the isentropic chain. Source: Internet
In this sense, a rapid compression of a gas is sometimes approximately or loosely said to be adiabatic, though often far from isentropic, even when the gas is not adiabatically isolated by a definite wall. Source: Internet
Inflation predicts that the observed perturbations should be in thermal equilibrium with each other (these are called adiabatic or isentropic perturbations). Source: Internet
Such a process is called an isentropic process and is said to be "reversible". Source: Internet
This compares the actual performance of the turbine with the performance that would be achieved by an ideal, isentropic, turbine. Source: Internet