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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.
accretion in Medicine. accretion acÂ·creÂ·tion (É-krÄ'shÉn) n. Growth or increase in size by gradual external addition, fusion, or inclusion. Increase by addition to the periphery of material of the same nature as that already present, as in the growth of crystals.