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mentonnière

[men-tuh n-yair; French mahn-taw-nyer]
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noun, plural men·ton·nières [men-tuh n-yairz; French mahn-taw-nyer] /ˌmɛn tənˈyɛərz; French mɑ̃ tɔˈnyɛr/. Armor.
  1. any of various plate pieces for protecting the lower part of the face, as a beaver.
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Origin of mentonnière

1815–25; < French, equivalent to menton chin + -ière, feminine of -ier -ier2; see brassiere
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018