/ Dictionary / Index P pyramidal tract: Meaning and Definition of Find definitions for: pyram'idal tract" Pronunciation: [key] — Anat. Anat. any of four tracts of descending motor fibers that extend in pairs down each side of the spinal column and function in voluntary movement. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. pyramidal pyramid bet Related Content Daily Word Quiz: deleterious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language