blackwater

• black water

From black +‎ water.

blackwater (usually uncountable, plural blackwaters)

1. Water containing loam, tannins, etc., giving it a very dark appearance. [from 15th c.]
2. Blackwater fever; malaria caused by Plasmodium falciparum. [from 19th c.]
   • 1954, Doris Lessing, A Proper Marriage, HarperPerennial 1995, p. 155:

     She began talking of the way they had died – blackwater, malaria, a neglected appendix.

3. Waste from domestic toilets; water containing fecal matter. [from 20th c.]
   • 2009 March 1, “Letter: Green Cruising Efforts”, in New York Times‎:

     Ms. Conlin failed to report, among other things, that air emissions are regulated and that our industry is exploring new technologies to further reduce emissions; that our ships treat all blackwater; and that advanced wastewater purification systems discharge water cleaner than most municipal water treatment plants.

• (waste water likely to contain fecal matter): brown water, foul water, sewage

• graywater
• greywater
• sullage
• washwater

• blackwater rafting