tribology

सापेक्ष गतिमा रहेका सतह, जस्तै बेयरिङ वा गियर, को अन्तरक्रिया, डिजाइन, घर्षण, खिइने र चिल्लो लगाउने प्रक्रियाको इन्जिनियरिङ अध्ययन

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