hammer-stone

hammerstone

[ham-er-stohn]
noun Archaeology.
an ancient stone tool used as a hammer, as for chipping flint, processing food, or breaking up bones.
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World English Dictionary
hammerstone (ˈhæməˌstəʊn)
 
n
a stone used as a hammer in the production of tools during the Acheulian period

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
hammerstone   (hām'ər-stōn')  Pronunciation Key 
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.
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