What does the word alum mean?
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A double sulphate of aluminum and of an alkaline earth or ammonium; the potassium salt is official as alumen in the U. S. P., both the potassium and the ammonium salts in the B. P. Chemically, an alum is any one of the double salts formed by a combination of a sulphate of aluminum, iron, manganese, chromium, or gallium, on one side, with a sulphate of lithium, sodium, potassium, ammonium, caesium, or rubidium, on the other.
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Symphytum-a. Cataplasm, Coagulum aluminosum-a. Egyptian, Aegyptia stypteria.
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