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WordReference Random House Unabridged Dictionary of American English © 2024metal′lic soap′, [Chem.]- any usually water-insoluble salt formed by the interaction of a fatty acid and a metal, esp. lead or aluminum: used chiefly as a drier in paints and varnishes and for waterproofing textiles.
Collins Concise English Dictionary © HarperCollins Publishers:: metallic soap n - any one of a number of colloidal stearates, palmitates, or oleates of various metals, including aluminium, calcium, magnesium, iron, and zinc. They are used as bases for ointments, fungicides, fireproofing and waterproofing agents, and dryers for paints and varnishes
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