Pronunciation: (trans-fôr'mur), [key]
1. a person or thing that transforms.
2. Elect.an electric device consisting essentially of two or more windings wound on the same core, which by electromagnetic induction transforms electric energy from one set of one or more circuits to another set of one or more circuits such that the frequency of the energy remains unchanged while the voltage and current usually change.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.