1) Rotating shaft 2) Shaft 
The shaft that transmits power from the transmission to the differential.
[n] - a rotating shaft that transmits power from the engine to the point of application
noun a rotating shaft that transmits power from the engine to the point of application
A long metal cylinder located between the transmission and the rear axle, in front-engine rear-wheel drive vehicles. The shaft is connected to the components on each end with a universal joint, which allows for movement up and down without bending the shaft.
The part of the transmission which transfers drive from the front or rear differential to the wheel. Each four-wheel drive rally car has four.