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Stone Milling. An early, primitive form of grinding cereals (q.v.) between two large, circular mill stones (q.v.), superimposed one on the other, with the upper rotating stone being driven by some source of power, such as water, wind, or electricity, and the lower stone remaining stationary. The grain (q.v.) is fed through the center core hole of the upper stone and passes between the two stones outwardly, being reduced to flour (q.v.) in the process.