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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.
antipyretic. 1. effective against fever; called also antifebrile. 2. something having this effect, such as a cold pack, aspirin, or quinine; antipyretic drugs dilate the blood vessels near the surface of the skin, thereby allowing more blood to flow through the skin, where it can be cooled by the air.