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Freebase(5.00 / 1 vote)Rate this definition: Electret. Electret is a dielectric material that has a quasi-permanent electric charge or dipole polarisation. An electret generates internal and external electric fields, and is the electrostatic equivalent of a permanent magnet. Oliver Heaviside coined this term in 1885.
A beret (UK /ËbÉreÉª/ BERR-ay or US /bÉËreÉª/ bÉ-RAY; [beÊÉ]) is a soft, round, flat-crowned hat, usually of woven, hand-knitted wool, crocheted cotton, wool felt, or acrylic fibre. Mass production began in 19th century France and Spain, countries with which it remains associated.