STEP Hebrew Lexicon: צָרַף

1) to smelt, refine, test

1a) (Qal)

1a1) to smelt, refine

1a2) to test

1a3) to test (and prove true)

1a4) smelter, refiner, goldsmith (participle)

1b) (Niphal) to be refined

1c) (Piel) to be a refiner

1c1) refiner (participle)