refine
re.fine \ri-'fi-n\ vt 1: to reduce to a pure state {~ sugar} 2: to free from moral imperfection : ELEVATE 3: to improve or perfect by pruning or polishing 4: to free from what is coarse, vulgar, or uncouth 1: to become pure or perfected 2: to make improvement by introducing subleties or distinctions - re.fin.er n