electrolytic capacitor

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A type of capacitor used to conduct current in a single direction, in which one oxide-coated plate serves as the dielectric while the other is replaced by an electrolyte.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun electronics capacitor that uses an electrolyte as one of its capacitative plates

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a fixed capacitor consisting of two electrodes separated by an electrolyte