ROT'TEN-STONE, noun A soft stone or mineral, called also Tripoli, terra Tripolitana, from the country from which it was formerly brought. It is used in all sorts of finer grinding and polishing in the arts, and for cleaning furniture of metallic substances. The rotten-stone of Derbyshire, in England, is a Tripoli mixed with calcarious earth.
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Webster's Dictionary 1828
American Dictionary of the English Language, Noah Webster, 1828.