gray water

noun

Definition of gray water

: household wastewater (as from a sink or bath) that does not contain serious contaminants (as from toilets or diapers)

Recent Examples of gray water from the Web

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'gray water.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of gray water

1977


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