hammerstone

noun

(archaeology) A type of stone used to hit or strike in a similar way to a modern-day hammer.

He picked up the hammerstone and began to shape the stone.

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意味（1）

(archaeology) A type of stone used to hit or strike in a similar way to a modern-day hammer.

Striking a hand-held isotropic block or cobble (a core) with a hammerstone initiates a cone-shaped crack at roughly 60° from the axis of force, exemplified by the hole in a plate glass window made by a pellet gun (18, 19 ).

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hammerstone

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