rottenstone

== English == === Etymology === From rotten +‎ stone. === Noun === rottenstone (countable and uncountable, plural rottenstones) (geology) A soft, friable limestone, used in polishes. === Verb === rottenstone (third-person singular simple present rottenstones, present participle rottenstoning, simple past and past participle rottenstoned) (transitive) To polish with rottenstone.