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electret

[ih-lek-trit]
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noun Electricity.
  1. a dielectric that possesses a permanent or semipermanent electric polarity, analogous to a permanent magnet.
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Origin of electret

First recorded in 1880–85; electr(icity) + (magn)et
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for electret

electret

noun
  1. a permanently polarized dielectric material; its electric field is similar to the magnetic field of a permanent magnet
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Word Origin

C20: from electr (icity + magn) et
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012