friction

(frik’shun) [L. frictio]. The act of rubbing: attrition. f.-fremitus. See fremitus. f.- murmur, f.-sound, the sound heard in auscultation caused by rubbing together of adjacent structures, as of the pericardium in pericarditis, the pleura in pleurisy, and the peritoneum in peritonitis. f.-sounds, Beatty-Bright’s, the friction-sound caused by inflammation of the pleura.