Plural of burstone; multiple pieces of burstone used as millstones or grinding surfaces.
From burstone (Middle English from Old French 'burre' + 'stone') + plural suffix '-s'. This straightforward pluralization reflects the common use of multiple stones in milling operations.
Old mills needed pairs of burstones—one on top, one on bottom—working together, and experienced millers could tell quality burstones by sight and touch, making stone selection a real craft!
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