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 of gray water
First recorded in 1975–80
Words nearby gray water
gray squirrel,
gray substance,
gray syndrome,
gray trout,
gray urn,
gray water,
gray whale,
gray wolf,
gray's inn,
gray-cheeked thrush,
gray-headed