1. Toxic compounds produced by certain freshwater cyanobacteria (blue-green algae), particularly Microcystis species, that can contaminate water supplies and pose health risks to humans and animals.
Usage: technical; plural form; singular is microcystin; commonly discussed in environmental science and public health contexts

Examples

• Microcystins were detected in the lake water following an algal bloom.
• The presence of microcystins in drinking water supplies prompted a public health advisory.
• Researchers are studying how microcystins accumulate in fish and other aquatic organisms.
• Microcystins can cause liver damage and neurological effects in exposed individuals.
• Water treatment facilities must monitor for microcystins to ensure safe drinking water.