/ Dictionary / Index M mentonnière: Meaning and Definition of Find definitions for: men•ton•nière Pronunciation: (men"tun-yâr' Fr. män-tô-nyer'), [key] — pl. -ton•nières any of various plate pieces for protecting the lower part of the face, as a beaver. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Menton mentoplasty Related Content Daily Word Quiz: soporific Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language