zinc sulfate

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A colorless crystalline compound, ZnSO₄·7H₂O, used medicinally as an emetic and astringent, as a fungicide, and in wood and skin preservatives.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a colorless water-soluble powder; used as a mordant or to preserve wood or for the electrodeposition of zinc