/ Dictionary / Index M motoneuron: Meaning and Definition of Find definitions for: mo•to•neu•ron Pronunciation: (mō"tu-noor'on, -nyoor'-), [key] — n. Cell Biol., motor neuron. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: motoneuron (Thesaurus) moton motor Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language