Definition of electret in US English:



  • A permanently polarized piece of dielectric material, analogous to a permanent magnet.

    • ‘The electret microphone (range, 20 to 25,000 Hz within three decibels) was fixed in a polyester cover.’
    • ‘Typically, all of the passive devices, except electret ion detectors, are available in hardware stores or by mail; electret ion detectors are usually only available through laboratories.’
    • ‘The analog input can accept microphone sources and can supply + 5V for electret condenser computer mics.’
    • ‘‘Well, we actually used miniature electret condenser mics,’ Vale explains.’
    • ‘There are mini headphone and microphone jacks - the unit includes a pair of headphones with a tiny electret mic attached on a boom - and a proprietary USB jack with cable supplied.’
    • ‘The passive device group includes alpha track detectors, charcoal canisters, charcoal liquid scintillation detectors, and electret ion chambers.’
    • ‘A small electret condenser monaural microphone is found on the top panel next to its speaker, so you can annotate each image with your own voice.’
    lodestone, magnetite
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Late 19th century: blend of electricity and magnet.