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Meaning of “grey water” in the English Dictionary

"grey water" in British English

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grey waternoun [U]

(US usually gray water) uk   /ˈɡreɪ ˌwɔː.tər/  us   /ˈɡreɪ ˌwɑː.t̬ɚ/
(Definition of grey water from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"grey water" in Business English

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grey waternoun [U]

(US gray water) uk   us   ENVIRONMENT
water that has been used before, for ​example for washing, that can be ​stored and used again: If more ​properties were ​fitted with a ​grey water ​system we would be ​saving up to 30% of our fresh water.
(Definition of grey water from the Cambridge Business English Dictionary © Cambridge University Press)
Translations of “grey water”
in Chinese (Simplified) 灰水(使用过的水)…
in Chinese (Traditional) 灰水(使用過的水)…
What is the pronunciation of grey water?
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