gray water

noun
dirty water from sinks, showers, bathtubs, washing machines, and the like, that can be recycled, as for use in flushing toilets.

Origin:
1975–80

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Main Entry:  gray water
Part of Speech:  n
Definition:  waste water from bathroom, kitchen, and laundry activities, esp. as it may be recycled for toilet and outside water uses; also written graywater
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Example sentences
Includes a relatively large loft area, gray water system, and a compost toilet.
The gray water tank holds water that drains from the kitchen and bathroom sinks.
The resort uses solar power and gray water recycling, limits water usage and
  stocks its restaurant with local foods.
Then dark gray water surged over the top of their building.
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