/ Dictionary / Index N nervous system: Meaning and Definition of Find definitions for: nerv'ous sys"tem Pronunciation: [key] — Anat., Zool. Anat.,Zool. the system of nerves and nerve centers in an animal or human, including the brain, spinal cord, nerves, and ganglia. a particular part of this system. Cf. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. nervous Nellie nervule Related Content Daily Word Quiz: clairvoyant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language