soap powder

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Also see: powder

Concise Oxford English Dictionary © 2008 Oxford University Press:
soap/səʊp/

▶noun

• 1 a substance used with water for washing and cleaning, made of a compound of natural oils or fats with sodium hydroxide or another strong alkali, and typically perfumed.

• 2 informal a soap opera.

▶verb wash with soap.

– derivatives
soapily adverb,
soapiness noun,
soapless adjective,
soapy adjective (soapier, soapiest).

– origin OE sāpe, of W. Gmc origin.