The meaning of Mill in the Bible
(From Easton's Bible Dictionary)

for grinding corn, mentioned as used in the time of Abraham (Genesis 18:6). That used by the Hebrews consisted of two circular stones, each 2 feet in diameter and half a foot thick, the lower of which was called the "nether millstone" (Job 41:24) and the upper the "rider." The upper stone was turned round by a stick fixed in it as a handle. There were then no public mills, and thus each family required to be provided with a hand-mill. The corn was ground daily, generally by the women of the house (Isaiah 47:1,2; Matthew 24:41). It was with the upper stone of a hand-mill that "a certain woman" at Thebez broke Abimelech's skull (Judges 9:53, "a piece of a millstone;" literally, "a millstone rider", i.e., the "runner," the stone which revolves. Compare II Samuel 11:21). Millstones could not be pledged (Deuteronomy 24:6), as they were necessary in every family.

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