/ Dictionary / Index B black water: Meaning and Definition of Find definitions for: black' wa'ter Pronunciation: [key] wastewater from toilets, garbage disposal, and industrial processes. Cf. gray water. black•wa•ter Pronunciation: (blak'wô"tur, -wot'ur), [key] — n. Pathol. any of several human or animal diseases characterized by the production of dark urine as a result of the rapid breakdown of red blood cells. See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: blackwater (Thesaurus) Black Watch blackwater fever Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language