thermionic vacuum tube

Found in Anh - Anh (Wordnet)

Definition Noun : A thermionic vacuum tube is an electronic device that controls electric current flow in a high vacuum between electrodes to which an electric potential difference has been applied. It typically consists of a system of electrodes (such as a cathode, anode, and often one or more grids) sealed within an evacuated glass or metal envelope. Usage The term is used to describe a found...