/ Dictionary / Index S sacral plexus: Meaning and Definition of Find definitions for: sa'cral plex'us Pronunciation: [key] a nerve network originating from the nerves of the sacral spine and innervating large areas of the lower trunk and legs, esp. via the sciatic nerves. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. sacral nerve sacrament Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language