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Meaning of mentonnière

men•ton•nière

Pronunciation: (men"tun-yâr' Fr. män-tô-nyer'), [key]
— pl. -ton•nières
  1. 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.