noun[mass noun] technical
Waste water and sewage from toilets. Compare with grey water.
- After consumption, about 80 per cent of the water comes out as waste and this includes black water and grey water.
- The sludge disaster was the nation's worst-ever black water spill.
- You can use water - not your drinking water, but gray water, or water that has been used before but is not yet dirtied to the point of black water.
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