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- a fragment removed from a core or nucleus of cryptocrystalline or fine-grained rock by percussion or pressure. May be used as a tool with no further deliberate modification, may be retouched, or may serve as a preform for further reduction.
- A thin flat asymmetrical piece of flint or other stone which was intentionally removed from a tool or projectile core during the process of manufacture or sharpening/resharpening.
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