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hammerstone

[ham-er-stohn]
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noun Archaeology.
  1. an ancient stone tool used as a hammer, as for chipping flint, processing food, or breaking up bones.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for hammerstone

hammerstone

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

hammerstone in Science

hammerstone

[hămər-stōn′]
  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.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.