polarizer

[poh-luh-rahy-zer]
noun
1.
a person or thing that polarizes.
2.
Optics. a device, often a crystal or prism, that polarizes light.

Origin:
1850–55; polarize + -er1

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
polarizer or polariser (ˈpəʊləˌraɪzə)
 
n
a person or a device that causes polarization
 
polariser or polariser
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Remove the first-order red compensator and uncross the polarizer.
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