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From The Collaborative International Dictionary of English v.0.48:
Puddling \Pud"dling\, n. 1. (Hydraul. Engin.) (a) The process of working clay, loam, pulverized ore, etc., with water, to render it compact, or impervious to liquids; also, the process of rendering anything impervious to liquids by means of puddled material. (b) Puddle. See Puddle, n., 2. [1913 Webster] 2. (Metal.) The art or process of converting cast iron into wrought iron or steel by subjecting it to intense heat and frequent stirring in a reverberatory furnace in the presence of oxidizing substances, by which it is freed from a portion of its carbon and other impurities. [1913 Webster] Puddling furnace, a reverberatory furnace in which cast iron is converted into wrought iron or into steel by puddling. [1913 Webster]