Glycerin. Glycerin is an ingredient that can be found in many beauty products because of its moisture locking properties. It is a form of sugar alcohol that is available naturally in vegetable oils and can also be the byproduct of soap making.
Definition of wheel and axle : a mechanical device consisting of a grooved wheel turned by a cord or chain with a rigidly attached axle (as for winding up a weight) together with the supporting standards
When a four-wheeled vehicle has torque supplied to both axles, this is described as all-wheel drive (AWD). However, four-wheel drive typically refers to a set of specific components and functions, and/or intended offroad application, which generally complies with modern use of the terminology.