/ Dictionary / Index M motor neuron: Meaning and Definition of Find definitions for: mo'tor neu"ron Pronunciation: [key] a nerve cell that conducts impulses to a muscle, gland, or other effector. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. motor-mouth motor pool Related Content Daily Word Quiz: vertigo Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language