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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History and Etymology for ellipsometer

ellipse + -o- + -meter

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