nephelometer
noun
neph·e·lom·e·ter ˌne-fə-ˈlä-mə-tər 
1
: an instrument for measuring the extent or degree of cloudiness
2
: an instrument for determining the concentration or particle size of suspensions by means of transmitted or reflected light
nephelometric
ˌne-fə-lō-ˈme-trik
adjective nephelometrically
ˌne-fə-lō-ˈme-tri-k(ə-)lē
adverb nephelometry
ˌne-fə-ˈlä-mə-trē
noun 
Word History
Etymology
Greek nephelē cloud + International Scientific Vocabulary -meter
First Known Use
1884, in the meaning defined at sense 1
Medical Definition
nephelometer
noun
neph·e·lom·e·ter ˌnef-ə-ˈläm-ət-ər
: an instrument for measuring cloudiness: as
a
: a set of barium chloride or barium sulfate standards used for estimating the turbidity of a fluid and thereby the number of bacteria in suspension
b
: an instrument for determining the concentration or particle size of suspensions by means of transmitted or reflected light