microburin
/ˌmʌɪkrəʊˈbjʊərɪn/Archaeol.
noun
A fragment of stone remaining after a blade has been notched and its end snapped off, this being a characteristic waste product in the manufacture of microliths; (occasionally in early use) a small fragment of this nature used as a tool rather than as waste material.
Origin
1930s; earliest use found in Man: a monthly record of anthropological science. From French microburin from micro- + burin.