For electrolytic capacitor we have a term and definition in Capacitors.

Electrolytic Capacitor (Capacitors)

A capacitor is typically made up of two (2) parallel plates, the electrodes, with a dielectric between them. The amount of capacitance is directly proportional to the surface area of the electrode and indirectly proportional to the dielectric thickness.
An electrolytic capacitor consists of a series combination of two capacitors (e.g. foil electrodes or plates) at least one of which is a valve metal, separated by an electrolyte, and between which a dielectric film is formed adjacent to the surface of one or both of the electrodes.
The high volumetric efficiency of an electrolytic capacitor is due to its enhanced plate surface area and a very thin dielectric layer. The dielectric is an oxide and has a high dielectric strength which is electrochemically deposited in very thin layers, usually on the order of hundreds to tens of thousands of Ångstrom units.

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