Millstone
Millstones were used for grinding grain and pressing oil out of olives. Some were small enough to be turned by hand, but others were so huge that they had to be turned by an animal. It may have been a large millstone similar to this one that Samson was forced to turn for the Philistines. (Jg 16:21) The animal-powered mill was common not only in Israel but also throughout much of the Roman Empire.
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