Blackwater

Noun

1. Water, especially in a river or other body of water, that has a naturally dark appearance. Water that contains dark organic matter such as loam or tannins. .mw-parser-output .defdate{font-size:smaller} Water that is acidic and low in nutrients.
2. Water that contains dark organic matter such as loam or tannins. .mw-parser-output .defdate{font-size:smaller}
3. Water that is acidic and low in nutrients.
4. Blackwater fever; malaria caused by Plasmodium falciparum.
5. Waste from domestic toilets; water containing fecal matter.