polarimeter
noun
po·lar·im·e·ter
ˌpō-lə-ˈri-mə-tər
1
: an instrument for determining the amount of polarization of light or the proportion of polarized light in a partially polarized ray
2
: a polariscope for measuring the amount of rotation of the plane of polarization especially by liquids
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Merriam-Webster unabridged
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