bleaching powder

(blē'chĭng)
n.
A powder containing calcium chloride and calcium hypochlorite, used in solution as a bleach. Also called chloride of lime, chlorinated lime.

A white solid regarded as a mixture of calcium chlorate(I), calcium chloride, and calcium hydroxide. It is prepared on a large scale by passing chlorine gas through a solution of calcium hydroxide. Bleaching powder is sold on the basis of available chlorine, which is liberated when it is treated with a dilute acid. It is used for bleaching paper pulps and fabrics and for sterilizing water.

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Calcium hypochlorite used as a bleaching and disinfectant agent. Called also chlorinated lime (chloride of lime) and used in error in whitewash. Causes skin and eye irritation and enteritis if ingested.

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The noun has one meaning:

Meaning #1: a white powder comprised of calcium hydroxide and chloride and hypochlorite and used to bleach and/or disinfect
  Synonym: bleaching powder

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