International Standard Bible Encyclopedia
foun'-der (from tsaraph): A worker in molten metal (Judges 17:4, etc.).
The word in the King James Version in Jeremiah 10:9, 14; Jeremiah 51:17 is rendered in the Revised Version (British and American) "goldsmith," and in 6:29 by a paraphrase, "They go on refining."
See REFINER; GOLDSMITH.