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aluminum ammonium sulfate

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noun Chemistry.
  1. a crystalline solid, AlNH4(SO4)2⋅12H2O, used chiefly as a size in the manufacture of paper; alum.
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Also called ammonium alum, ammonia alum.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018