hammerstone

noun Archaeology.

1. an ancient stone tool used as a hammer, as for chipping flint, processing food, or breaking up bones.

noun

1. a stone used as a hammer in the production of tools during the Acheulian period

1. A hand-held stone or cobble used by hominids perhaps as early as 2.5 million years ago as a crude pounding or pecking tool. Hammerstones were also used by early humans in striking flakes from stone cores to produce core tools.