/ Dictionary / Index M motor cortex: Meaning and Definition of Find definitions for: mo'tor cor"tex Pronunciation: [key] the region of the cerebral cortex concerned with transmitting impulses to the voluntary muscles. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. motorcar motor court Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language