papillary muscle: Meaning and Definition of

pap'illary mus'cle

Pronunciation: [key]
— Anat. Anat.
  1. one of the small bundles of muscles attached to the ventricle walls and to the chordae tendineae that tighten these tendons during ventricular contraction.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.