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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.
Chambers 20th Century Dictionary(0.00 / 0 votes)Rate this definition: Decretal. de-krÄâ²tal, adj. pertaining to a decree.ân. a decree, esp. of the pope: a book containing decrees: spec. in pl. the second part of the canon law, the decrees of various popes determining points of ecclesiastical law.ân.