gray water
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noun
dirty water from sinks, showers, bathtubs, washing machines, and the like, that can be recycled, as for use in flushing toilets.
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Origin of gray water
First recorded in 1975–80
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022
Scientific definitions for gray water
graywater
[ grā′wô′tər ]
Wastewater from baths, bathroom sinks, and washing machines that does not contain body or food wastes. Graywater can be recycled especially for use in gardening or for flushing toilets. Compare blackwater.
The American Heritage® Science Dictionary
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