1. An instrument in which information is stored as electrostatic charges on a dielectric surface (insulating material or a very poor conductor of electric current, but an efficient supporter of electrostatic fields).
2. A storage in which information is kept as the presence or absence of electrostatic charges at specific spot locations, generally on the screen of a special type of cathode-ray tube known as a storage tube.
3. The storage of changeable information in the form of charged or uncharged areas usually on the screen of a cathode-ray tube.
4. A memory which stores information in the form of the presence or absence of electrostatic charges at specific locations; such as, on the screen of a special cathode-ray tube known as a storage tube or cells of dynamic random-access memories.