Turboshaft engine
A turbine engine in which several stages of turbines are used to extract as much energy as possible. The turbines drive shafts which are used to drive helicopter rotors, generators, or pumps.
Aviation Maintenance Technician Handbook — Powerplant, p. G-29
Also defined in 2 more sources
A turbine engine transmitting power through a shaft as would be found in a turbine helicopter.
A gas turbine engine that delivers power through a shaft to operate something other than a propeller.