1. plural of blackwater; water that is dark or discolored, often from organic matter, tannins, or other dissolved substances
Usage: commonly used in ecology and geography to describe rivers and streams in tropical regions
2. plural of blackwater; wastewater from toilets and other sanitary facilities
Usage: technical term used in plumbing and environmental management

Examples

• The Amazon basin contains many blackwaters that flow through dense rainforest.
• Blackwaters are rich in organic compounds and support unique ecosystems.
• The treatment plant processes both greywater and blackwaters separately.
• Fish species in blackwaters have adapted to low-light conditions.
• Proper disposal of blackwaters is essential for environmental protection.
• The river's blackwaters indicate high levels of dissolved tannins from decaying vegetation.