crepitus Syllabification: (crep·i·tus)Pronunciation: /ˈkrepətəs/Definition of crepitus noun Medicine a grating sound or sensation produced by friction between bone and cartilage or the fractured parts of a bone. the production of crepitations in the lungs; rale. Origin: early 19th century: from Latin, from crepare 'rattle'crepitus in other Oxford dictionaries Definition of crepitus in the British & World English dictionary