from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A purification technique for crystalline substances in which a heating system passes slowly over a bar of the material to be refined, creating a molten region that carries impurities with it across the bar.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun physics, chemistry A technique used to purify a metal, semiconductor or other solid in which a heating system slowly causes a series of molten zones to traverse the solid, leaving purer material behind it.


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