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English definition of “grey water”

grey water

noun [U] (US usually gray water)    
water that has been used before, for example for washing, that can be stored and used again, for example in toilets: Water companies are testing recycling units which take grey water and clean it up sufficiently for flushing toilets.Environmental issuesRubbish and wasteProtection and protectorsWater in general
(Definition of grey water noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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