bleaching powder definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
any powder used in bleaching; esp., chloride of lime
bleaching powder definition by American Heritage Dictionary
A powder containing calcium chloride and calcium hypochlorite, used in solution as a bleach. Also called chloride of lime, chlorinated lime.