TRIBOLOGY /tɹaɪˈbɒləd͡ʒi/ ► audio Scrabble 15 Words With Friends 17 Definition 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. See all 140 words you can make from TRIBOLOGY → 9-letter words Words starting with T Words ending with Y ← Unscramble different letters