blackwater

/ˈblækˌwɔtər/
noun
  1. Wastewater from toilets and other sources that contains human waste.
    • Improper disposal of blackwater can contaminate groundwater.
    • The treatment plant processes blackwater separately from graywater.
    • The camping trailer has a special tank for storing blackwater.
  2. Dark-colored water, often found in swamps or flooded forests, caused by decaying plant matter.
    • Kayaking through the blackwater river felt like gliding through a shadow.
    • Many fish species thrive in the acidic blackwater of the Amazon basin.
    • The blackwater of the swamp was so dark it looked like tea.
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