An Etymological Dictionary of Astronomy and Astrophysics

1. Meteo.: A measure of vertical extinction of solar radiation in the atmosphere. Turbidity is directly related to aerosol concentrations in the tropospheric and stratospheric layers. → visibility.
   

2. The cloudiness or haziness of a fluid caused by individual particles (suspended solids) that are generally invisible
   to the naked eye, similar to smoke in air.

See also: → turbid; → -ity.