/ Dictionary / Index B brachial plexus: Meaning and Definition of Find definitions for: bra'chial plex'us Pronunciation: [key] — Anat. Anat. a network of nerves in the armpits and neck, innervating the shoulders, arms, and hands. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. brachialgia brachiate Related Content Daily Word Quiz: fabricate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language