Elec. a device consisting of two or more conducting plates separated from one another by a dielectric nonconductor, as glass, mica, plastic, or dry air, used for storing an electric charge; condenser
See capacitor in American Heritage Dictionary 4
(kə-păsˈĭ-tər)
noun
An electric circuit element used to store charge temporarily, consisting in general of two metallic plates separated and insulated from each other by a dielectric. Also called condenser.