zāqaq זָקַק ‘to refine’ (Hebrew)

Etymology^?: a primitive root

zāqaq v
1) to purify, distil, strain, refine
 1a) (Qal)
  1a1) to purify, distil, strain
  1a2) to refine
 1b) (Piel) to purge, refine
 1c) (Pual) to refine, purify