grey water Meaning, definition in Cambridge English Dictionary
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Meaning of "grey water" - English Dictionary

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grey waternoun [U]

(US usually gray water) uk   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.
Translations of “grey water”
in Chinese (Traditional) 灰水(使用過的水)…
in Chinese (Simplified) 灰水(使用过的水)…
(Definition of grey water from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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