a permanently polarized dielectric material; its electric field is similar to the magnetic field of a permanent magnet
Word origin
C20: from electr(icity + magn)et
electret in American English
(iˈlɛktrɪt; iˈlɛkˌtrɛt; ɪˈlɛktrɪt; ɪˈlɛkˌtrɛt)
noun
any of certain solid, dielectric materials that have a permanent electric charge after being melted and resolidified in a strong electric field: used in telephones, microphones, etc.