
1) Optical component
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https://www.crosswordclues.com/clue/depolarizer

A depolarizer or depolariser, in electrochemistry, according to an IUPAC definition, is a synonym of electroactive substance, i.e., a substance which changes its oxidation state, or partakes in a formation or breaking of chemical bonds, in a charge-transfer step of an electrochemical reaction. In the battery industry, the term `depolarizer` has .....
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http://en.wikipedia.org/wiki/Depolarizer
[optics] A depolarizer or depolariser is an optical device used to scramble the polarization of light. An ideal depolarizer would output randomly polarized light whatever its input, but all practical depolarizers produce pseudo-random output polarization. Optical systems are often sensitive to the polarization of light reaching them (for ex...
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http://en.wikipedia.org/wiki/Depolarizer_(optics)

• (n.) A substance used to prevent polarization, as upon the negative plate of a voltaic battery.
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http://thinkexist.com/dictionary/meaning/depolarizer/

A substance that produces depolarization
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http://www.encyclo.co.uk/local/21115
De·po'lar·i`zer noun (Electricity) A substance used to prevent polarization, as upon the negative plate of a voltaic battery.
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http://www.encyclo.co.uk/webster/D/40

a substance added to the electrolyte of an electric cell or battery to remove gas collected at the electrodes.
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https://www.infoplease.com/dictionary/depolarizer
No exact match found.