Meaning of aluminum ammonium sulfate

alu'minum ammo'nium sul'fate

Pronunciation: [key]
— Chem. Chem.
  1. a crystalline solid, AlNH(SO)&multiplydot;12HO, used chiefly as a size in the manufacture of paper; alum. Also called
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.