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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.
Electrum is the internal temporal pushing metal alloy made from gold and silver. An Allomancer burning electrum is able to see who they may become in the future, depending on his choices. Feruchemists can use electrum to store determination, and when used as a Hemalurgic spike, electrum steals an unknown quality.