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ammonium alum

noun, Chemistry

aluminum ammonium sulfate

noun, Chemistry
1.
a crystalline solid, AlNH 4 (SO 4) 2 ⋅12H 2 O, used chiefly as a size in the manufacture of paper; alum.
Also called ammonium alum, ammonia alum.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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