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ellipsometer

American  
[ih-lip-som-i-ter, el-ip-, ee-lip-] / ɪ lɪpˈsɒm ɪ tər, ˌɛl ɪp-, ˌi lɪp- /

noun

Optics.
  1. an instrument that measures the ellipticity of polarized light, used for determining the thickness of thin films.


Etymology

Origin of ellipsometer

ellipse + -o- + -meter

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