polariscope

[poh-lar-uh-skohp, puh-]
noun Optics.
an instrument for measuring or exhibiting the polarization of light or for examining substances in polarized light, often to determine stress and strain in glass and other substances.

Origin:
1820–30; < Medieval Latin polāri(s) polar + -scope

polariscopic [poh-lar-uh-skop-ik, puh-] , adjective
polariscopically, adverb
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World English Dictionary
polariscope (pəʊˈlærɪˌskəʊp)
 
n
See photoelasticity an instrument for detecting polarized light or for observing objects under polarized light, esp for detecting strain in transparent materials

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Shine the flashlight into one end of the polariscope, and view the light from the other end.
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