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

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

neph′e·lo·met′ric (-lō-mĕt′rĭk) adj.
neph′e·lom′e·try n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Chemistry) chem an instrument for measuring the size or density of particles suspended in a fluid
[C19 (in the sense: an instrument for measuring the cloudiness of the sky): from Greek nephelē cloud + -o- + -meter]
nephelometric adj
ˌnepheˈlometry n
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˌnɛf əˈlɒm ɪ tər)

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- (comb. form representing Greek nephélē cloud; see nebula) + -o- + -meter]
neph`e•lo•met′ric (-ləˈmɛ trɪk) neph`e•lo•met′ri•cal, adj.
neph`e•lo•met′ri•cal•ly, adv.
neph`e•lom′e•try, n.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
Light scattering by atmospheric aerosols at the FAN stations is measured using integrating nephelometers [currently, either the TSI (model 3563, TSI Inc.) or the Ecotech (Aurora 3000/4000, Ecotech) nephelometer].
Nephelometers are portable, cost less than reference method monitors, and can easily be deployed indoors.
We deployed portable particulate matter monitors -- active-flow and passive personal DataRAM (pDR 1000AN and pDR-1200, Thermo Electron Corp., Franklin, MA) nephelometers -- which continuously measured PM[sub.2.5] and PM[sub.10] (particulate matter less than 10 μm in diameter), respectively.
Smoke particulate - as measured here by Lane Regional Air Protection Agency nephelometers - spiked locally on Monday, which was the same day Russian President Dmitry Medvedev declared a state of emergency in seven regions of Russia.
Some nephelometers, including the BN II, have automated detection algorithms designed to detect antigen excess.
Exposure assessment and modeling of particulate matter for asthmatic children using personal nephelometers. Atmos Environ.
Assayed values provided on a list of methods includes nephelometers and immunochemistry analyzers.
Nephelometers are available in lab or field-based versions, and they vary in terms of sample preparation requirements.
The company offers nephelometers and absorptometers, the former being highly sensitive to low turbidities and the latter, termed the Falling Stream Turbidimeter, recommended for high turbidity ranges.