Turbidity (noun)

1. The state of being cloudy, murky, or disturbed.
2. The cloudiness or haziness of a liquid, caused by suspended matter.

Origin:

Late 17th century: from latin turbidus, from turbar 'to confuse, disturb'.

Examples:

1. The turbidity of the water made it difficult to see the fish.
2. The turbidity of the air was so thick you could hardly see the sun.
3. The lake was known for its high levels of turbidity after heavy rains.
4. The turbidity of the soup was because of the over-boiled vegetables.
5. Scientists use turbidity as an indicator of water quality.