[nik-uh l] /ˈnɪk əl/

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


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