/ Dictionary / Index T trapezius: Meaning and Definition of Find definitions for: tra•pe•zi•us Pronunciation: (tru-pē'zē-us), [key] — pl. -us•es. a broad, flat muscle on each side of the upper and back part of the neck, shoulders, and back, the action of which raises, or rotates, or draws back the shoulders, and pulls the head backward or to one side. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: trapezius (Thesaurus) trapezium trapezohedron Related Content Daily Word Quiz: loathe Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language