foun'-der (from tsaraph): A worker in molten metal (Jg 17:4, etc.). The word in the King James Version in Jer 10:9,14; 51:17 is rendered in the Revised Version (British and American) "goldsmith," and in Jer 6:29 by a paraphrase, "They go on refining."
⇒See the definition of founder in the KJV Dictionary
See REFINER; GOLDSMITH.