transformer

trans•form•er n. [countable]

a person or thing that transforms.
Electricitya device that transfers electrical energy from one circuit to another:When you visit Europe from the U.S., you may need a transformer for your electrical appliances.

trans•form•er n.

a person or thing that transforms.
[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.

Collins Concise English Dictionary © HarperCollins Publishers::

transformer /trænsˈfɔːmə/ n

a device that transfers an alternating current from one circuit to one or more other circuits, usually with an increase (step-up transformer) or decrease (step-down transformer) of voltage. The input current is fed to a primary winding, the output being taken from a secondary winding or windings inductively linked to the primary
a person or thing that transforms

'transformer' also found in these entries (note: many are not synonyms or translations):

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