tribology

The science of the mechanisms of friction, lubrication, and wear of interacting surfaces that are in relative motion.

the study of the effects of friction on parts of machinery moving in contact with each other, and of methods, such as lubrication, to counteract negative effects such as wear.

The science and technology of friction, lubrication, and wear.

the branch of engineering that deals with the interaction of surfaces in relative motion (as in bearings or gears): their design and friction and wear and lubrication