pipeclay

== English == === Etymology === From pipe +‎ clay. === Pronunciation === === Noun === pipeclay (countable and uncountable, plural pipeclays) Catlinite ==== Synonyms ==== pipestone === Verb === pipeclay (third-person singular simple present pipeclays, present participle pipeclaying, simple past and past participle pipeclayed) (transitive) To whiten by application of pipeclay. (transitive, slang, dated, UK) To clear off.