Rŏt'ten-stōne, n.
n. (Min.) A soft stone, called also Tripoli, from the country from which it was formerly brought, used in all sorts of finer grinding and polishing in the arts, and for cleaning metallic substances.
n. (Min.) A soft stone, called also Tripoli, from the country from which it was formerly brought, used in all sorts of finer grinding and polishing in the arts, and for cleaning metallic substances.