capacitor

ca·pac·i·tor

noun \kə-ˈpas-ət-ər\

Definition of CAPACITOR

: a device giving capacitance and usually consisting of conducting plates or foils separated by thin layers of dielectric (as air or mica) with the plates on opposite sides of the dielectric layers oppositely charged by a source of voltage and the electrical energy of the charged system stored in the polarized dielectric