petit tranchet
/ˌpɛtɪ ˈtrɑːn(t)ʃeɪ/ /ˌpɛtɪ ˈtran(t)ʃeɪ/Archaeol.
noun
A small stone artefact of Mesolithic and Neolithic cultures, whose end forms a broad, chisel-like cutting edge, typically used as an arrowhead; a small tranchet.
Origin
1920s. Apparently from French petit tranchet from petit + tranchet.