Fuller-s-earth meaning

fo͝ol'ərz
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.
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A highly absorbent, opaque clay used to remove grease from woolen cloth in fulling, to clarify fats and oils, etc.
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A fine clay used in fulling cloth.
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