POLARIMETER
polarimeter, polariscope
(noun) an optical device used to measure the rotation of the plane of vibration of polarized light
Source: WordNet® 3.1
Etymology
Noun
polarimeter (plural polarimeters)
An instrument used to measure the rotation of the plane of polarized light as it passes through a sample of an optically active compound.
Synonyms
• polariscope
Source: Wiktionary
Po`lar*im"e*ter, n. Etym: [Polar + -meter.] (Opt.)
Definition: An instrument for determining the amount of polarization of
light, or the proportion of polarized light, in a partially polarized
ray.
Source: Webster’s Unabridged Dictionary 1913 Edition