ellipsometer

[ih-lip-som-i-ter, el-ip-, ee-lip-]
noun Optics.
an instrument that measures the ellipticity of polarized light, used for determining the thickness of thin films.

Origin:
ellipse + -o- + -meter

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The ellipsometer imaging system allows visualization of the surface of the subject's cornea.
Ellipsometer of specular glazing materials are well established.
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