Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio.
an alum of which one of the components is chromium; esp., potassium chromium sulfate, KCr(SO)·12HO, used in tanning and dyeing
Used by arrangement with John Wiley & Sons, Inc.
nounThe American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
A violet-red crystalline compound, CrK(SO4)2·12H2O, used in tanning, as a mordant, and in photography.