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Definition of blackwater

blackwater

/ˈblækˌwɔːtər/
black · wa · ter
Plural:blackwaters
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blackwater Lexical Profile

blackwater Game Scores & Validity

• noun

1

Wastewater from toilets containing human waste, pathogens, and toilet paper, requiring thorough treatment before disposal or reuse.

Example

"Modern off-grid homes often separate blackwater from greywater to simplify the sewage treatment process."

2

Slow-moving river or swamp water that is stained a dark, transparent brown or tea-like color by tannins leached from decaying vegetation.

Example

"The kayakers paddled silently through the calm blackwater of the cypress swamp."

3

Any of several infectious diseases in humans or livestock characterized by dark-colored urine resulting from the rapid breakdown of red blood cells, especially blackwater fever in malaria.

Example

"Early tropical medicine researchers sought effective treatments for patients suffering from blackwater."

Synonyms
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Antonyms
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Word Nuance & Usage

In plumbing and environmental engineering, 'blackwater' (wastewater from toilets) is strictly distinguished from 'greywater' (wastewater from sinks, showers, and laundry).

• Rhymes for blackwater

• Nearby Words

blackthorn
blacktip shark
blacktop
blackwater
blackwater falls
blackwood
blackwood river

Usage Trend

Historical frequency of usage in published text.

180019102020
Data source: Google Books Ngram Viewer

Cite this Entry

Wordmom. (2026). Definition of Blackwater. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/blackwater
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