from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun An apparatus that is used to measure the size and concentration of particles in a liquid by analysis of light scattered by the liquid.

from The Century Dictionary.

  • noun A proposed instrument which will make a continuous record of the proportion of cloudiness of the sky. No such instrument has yet been constructed.
  • noun In chem., an instrument for estimating the quantity of a solid substance suspended, in very small proportion and in a very finely divided state, in a liquid, as in the case of one or two milligrams of silver chlorid in a liter of water.

from the GNU version of the Collaborative International Dictionary of English.

  • noun An instrument for measuring or registering the amount of cloudiness.
  • noun (Chem., Microbiol.) An instrument which measures the degree to which liquid suspensions scatter light, and by inference, the concentration of scattering particles in the suspension. It is used for various purposes, such as to estimate the number of bacteria in suspension in a liquid.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun analytical chemistry An instrument for measuring various aspects of the suspended particles in a fluid; especially in a colloid.


from The American Heritage® Dictionary of the English Language, 4th Edition

[Greek nephelē, cloud; see nebh- in Indo-European roots + –meter.]


  • He invented the nephelometer and demonstrated the insidious effect of occluded moisture in gases and solids.

    Theodore W. Richards - Biography

  • With a view to being able to detect and determine even the minutest; trace of any precipitate suspended in a fluid, Richards, by adopting and adapting an earlier idea, has constructed his well-known nephelometer, which, by the use of reflected light, allows of a reliable quantitative assessment being made of "opalizing" quantities of substance so small that they could be determined gravimetrically only with the utmost difficulty, if indeed at all.

    Nobel Prize in Chemistry 1914 - Presentation

  • Then suddenly, out of the blue, the nephelometer is spotted returning safely under its own parachute.


  • Scientifically accurate measurements of turbidity are performed using a nephelometer.

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  • A nephelometer is used to measure the turbidity of water via the scattering of light through a water sample.

    June 26, 2009