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A highly adsorbent claylike substance consisting of hydrated aluminum silicates, used predominantly in fulling woolen cloth, in talcum powders, as a filter, and as a catalyst.
(Geological Science) a natural absorbent clay used, after heating, for decolorizing oils and fats, fulling cloth, etc
an absorbent clay, used esp. for removing grease from fabrics, in fulling cloth, as a filter, and as a dusting powder.