Nicol prism

noun Optics.
one of a pair of prisms used to produce and analyze plane-polarized light in a polarizing microscope. Also called Nicol. Compare polarizer ( def 1 ).

1870–75; after William Nicol (1768–1851), British physicist, its inventor Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
Nicol prism (ˈnɪkəl)
a device composed of two prisms of Iceland spar or calcite cut at specified angles and cemented together with Canada balsam. It is used for producing plane-polarized light
[C19: named after William Nicol (?1768--1851), Scottish physicist, its inventor]

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