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[nef-uh-lom-i-ter] /ˌnɛf əˈlɒm ɪ tər/
Bacteriology. an apparatus containing a series of barium chloride standards used to determine the number of bacteria in a suspension.
Physical Chemistry. an instrument for studying the density of suspended particles in a liquid by measuring the degree to which the suspension scatters light.
1880-85; nephel- (combining form representing Greek nephélē cloud; see nebula) + -o- + -meter
Related forms
[nef-uh-luh-me-trik] /ˌnɛf ə ləˈmɛ trɪk/ (Show IPA),
nephelometrical, adjective
nephelometrically, adverb
nephelometry, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for nephelometry


(chem) an instrument for measuring the size or density of particles suspended in a fluid
Derived Forms
nephelometric (ˌnɛfɪləʊˈmɛtrɪk) adjective
nephelometry, noun
Word Origin
C19 (in the sense: an instrument for measuring the cloudiness of the sky): from Greek nephelē cloud + -o- + -meter
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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nephelometry in Medicine

nephelometer neph·e·lometer (něf'ə-lŏm'ĭ-tər)
An apparatus used to measure the size and concentration of particles in a liquid by determining the amount of light scattered by the liquid.

neph'e·lo·met'ric (-lō-mět'rĭk) adj.
neph'e·lom'e·try n.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Encyclopedia Article for nephelometry

in analytical chemistry, methods for determining the amount of cloudiness, or turbidity, in a solution based upon measurement of the effect of this turbidity upon the transmission and scattering of light. Turbidity in a liquid is caused by the presence of finely divided suspended particles. If a beam of light is passed through a turbid sample, its intensity is reduced by scattering, and the quantity of light scattered is dependent upon the concentration and size distribution of the particles. In nephelometry the intensity of the scattered light is measured, while, in turbidimetry, the intensity of light transmitted through the sample is measured. Nephelometric and turbidimetric measurements are used in the determination of suspended material in natural waters and in processing streams. The technique is also used for determination of sulfur in coal, oil, and other organic materials; the sulfur is precipitated as barium sulfate.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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