Millstone is a type of stone used in windmills and watermills for grinding heat or other grains. It also refers to a borough in Somerset County, New Jersey, United States or a novel by Margaret Drabble.
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what is the definition of millstone
either of a pair of circular stones between which grain or another substance is ground, as in a mill.
anything that grinds or crushes.
any heavy mental or emotional burden (often used in the phrase a millstone around one's neck).