Electret
ahd-5
noun.
A solid dielectric that exhibits persistent dielectric polarization.
Wiktionary, Creative Commons Attribution/Share-Alike License
noun.
a solid
dielectric
having a
quasi
-
permanent
charge
; usually a
metallized
film
; used in
electroacoustic
and
electromechanical
transducers
and in air
filters
Word Usage
"From memory (I may be wrong) – they even supply the electret microphone."
Same Context
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