hammerstone

[ ham-er-stohn ]
/ ˈhæm ərˌstoʊn /

noun Archaeology.

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

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British Dictionary definitions for hammerstone

hammerstone
/ (ˈhæməˌstəʊn) /

noun

a stone used as a hammer in the production of tools during the Acheulian period
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for hammerstone

hammerstone
[ hămər-stōn′ ]

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.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.