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ellipsometer
noun
el·lip·som·e·ter
\ə̇ˌlipˈsämətə(r), eˌ-, ēˌ-, ˌe(ˌ)-\
Definition of ellipsometer
: a polarimeter designed especially for determining the ellipticity of polarized light
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Origin and Etymology of ellipsometer
ellipse + -o- + -meter
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