tranchet

[trahn-shey; French trahn-she]
noun, plural tran·chets [trahn-sheyz; French trahn-she] /trɑnˈʃeɪz; French trɑ̃ˈʃɛ/. Archaeology.
  1. a stone implement with a horizontal, chisellike cutting edge, found at Mesolithic and Neolithic sites in macrolithic form, used as an adz, and in microlithic form, often mounted as the cutting head of an arrow.

Origin of tranchet

< French, equivalent to tranch(er) to cut (see trench) + -et -et
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018