/ Dictionary / Index P pectoral girdle: Meaning and Definition of Find definitions for: pec'toral gir'dle Pronunciation: [key] (in vertebrates) a bony or cartilaginous arch supporting the forelimbs. Also called(in humans) the bony arch formed by the clavicles, or collarbones, and scapulas, or shoulder blades. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. pectoral fin pectoralis Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language