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insoluble calcium salt of stearic acid and palmitic acid; it is formed when soap is mixed with water that contains calcium ions and is the scum produced in regions of hard water calcium octadecanoate , calcium stearate
any of various algae of the genus Tribonema; algae with branching filaments that form scum in still or stagnant fresh water conferva
scum formed by oxidation at the surface of molten metals dross , scoria , slag
simple parasitic fungi including pond scum parasites genus Synchytrium , Synchytrium
aquatic fungus of genus Synchytriaceae that is parasitic on pond scum pond-scum parasite
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