/ Dictionary / Index P papillary muscle: Meaning and Definition of Find definitions for: pap'illary mus'cle Pronunciation: [key] — Anat. Anat. 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. papillary papilliform Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language