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English definition of “grey water”

grey water

noun [U] uk (US usually gray water)   us  
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.
(Definition of grey water from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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