n. Waste water likely to contain significant quantities of fecal matter.
the GNU version of the Collaborative International Dictionary of English
n. any of several human or animal diseases characterized by dark urine resulting from rapid breakdown of red blood cells; -- used especially of blackwater fever, a severe form of malaria caused by the blood parasite Plasmodium falciparum.
The Century Dictionary and Cyclopedia
n. A disease of sheep.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. any of several human or animal diseases characterized by dark urine resulting from rapid breakdown of red blood cells
Word Usage
"Any river that flowed from marshlands was referred to as a blackwater river because it was darkened by deposits of decaying vegetation."