crepitus
Concise Oxford English Dictionary © 2008 Oxford University Press:
crepitus /ˈkrɛpɪtəs/
▶noun Medicine a grating sound or sensation produced by friction between bone and cartilage or the fractured parts of a bone.
■ the production of rattling sounds in the lungs.
– origin C19: from L., from crepare ‘rattle’.
'crepitus' also found in these Oxford entries:

