A hard stone or rock used as a grinding tool or sharpening stone, particularly in historical contexts for honing metal tools.
From Old English 'bit' (a small piece or tool) combined with 'stone.' The term evolved to describe whetstones or grinding stones used to maintain sharp edges on tools and weapons throughout medieval times.
Bitstones reveal how metalworking cultures standardized their tool maintenance—archaeological digs find them in Viking settlements and Roman military camps, showing that keeping tools sharp was as important 2,000 years ago as it is in modern workshops.
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