pericardial friction sound

n.
  1. An oscillating creaking sound sometimes heard on auscultation, caused by the rubbing together of inflamed pericardial surfaces as the heart contracts and relaxes.pericardial rub
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.