/ Dictionary / Index E extrapyramidal system: Meaning and Definition of Find definitions for: extrapyram'idal sys"tem Pronunciation: [key] — Anat. Anat. the part of the central nervous system, including the descending motor fibers other than those of the pyramidal tract, that regulates muscle tone, posture, and other aspects of body movement. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. extrapyramidal extrasensorial Related Content Daily Word Quiz: grimace Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language