nephelometer

1. General name for instruments that measure, at more than one angle, the scattering function of particles suspended in a medium.
   Information obtained from such instruments may be used to determine the size of the suspended particles and the visual range through the medium.
   
2. 
   Same as nephometer.
   Middleton, W. E. K. 1952. Vision through the Atmosphere. 200–212.

1. A gaseous envelope gravitationally bound to a celestial body (e.g., a planet, its satellite, or a star).