spectropolarimeter
[ spek-troh-poh-luh-rim-i-ter ]
/ ˌspɛk troʊˌpoʊ ləˈrɪm ɪ tər /
noun Optics.
an instrument for determining the extent to which plane-polarized light of various wavelengths is rotated by certain solutions, consisting of a combination of a spectroscope and a polarimeter.