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
Definition of wheel for English Language Learners. : 1  one of the round parts underneath a car, wagon, etc., that rolls and allows something to move. : 2  a hard, round object that turns and causes machinery or a mechanical device to move. : 3  something that is round like a wheel or that turns like a wheel.