refining
verb(re-fine)
to free (something, such as metal, sugar, or oil) from impurities or unwanted material
refining
verb(re-fine)
to free from moral imperfection : elevate
refining
verb(re-fine)
to improve or perfect by pruning or polishing
refining
noun(re-fine)
a technique for the purification of a crystalline material and especially a metal in which a molten region travels through the material to be refined, picks up impurities at its advancing edge, and then allows the purified part to recrystallize at its opposite edge —called also zone melting