S: (v) refine (treat or prepare so as to put in a usable condition) "refine paper stock"; "refine pig iron"; "refine oil"
S: (v) refine, rectify (reduce to a fine, unmixed, or pure state; separate from extraneous matter or cleanse from impurities) "refine sugar"
S: (v) refine (attenuate or reduce in vigor, strength, or intensity by polishing or purifying) "many valuable nutrients are refined out of the foods in our modern diet"
S: (v) refine (make more precise or increase the discriminatory powers of) "refine a method of analysis"; "refine the constant in the equation"