Rotten stone

Also found in: Thesaurus, Encyclopedia, Wikipedia.
(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. The name is also given to other friable siliceous stones applied to like uses.

See also: Rotten

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
Part of the restoration work involved cutting back half an inch of rotten stone from the front wall.
Focusing in turn on two of Holmes' research areas, biblical scholars explore such topics as patristic evidence in the apparatus criticus of a Greek New Testament, water and blood in Matthew 27:49: a Johannine reading in the Matthean passion narrative, the selection of Greek manuscripts to be included in the International Greek New Testament Project's edition of John in the Editio Critica Maior, the apocalyptic "adversary" in the Martyrdom of Polycarp and the Martyrs of Lyons, defining exceptions in the Didache, and "Rotten Stones" and other marginalia in the Shepherd of Hermas.