/ Dictionary / Index P peripheral nervous system: Meaning and Definition of Find definitions for: periph'eral nerv'ous sys"tem Pronunciation: [key] the portion of the nervous system lying outside the brain and spinal cord. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. peripheralism peripheral vision Related Content Daily Word Quiz: cygnet Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language