'tribology' definitions:

Definition of 'tribology'

From: WordNet
noun
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

Definition of 'tribology'

From: GCIDE
  • tribology \tri*bol"o*gy\, n. [tribo- + -ology.] 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. [PJC]