photopolarimeter

noun
pho·to·po·la·rim·e·ter | \ˌfō-tō-ˌpō-lə-ˈri-mə-tər \

Definition of photopolarimeter 

: an instrument used to measure the intensity and polarization of reflected light (as from clouds enveloping a planet)

First Known Use of photopolarimeter

circa 1889, in the meaning defined above

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The first known use of photopolarimeter was circa 1889

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