thermionic valve ther·mio·nic·valve uncommon noun 1. electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope Synonymstubevacuum tubethermionic vacuum tubethermionic tubeelectron tubethermionic valve Related words Broader terms electronic device Narrower terms acorn tubediodeelectron multipliergas-discharge tubeklystronmagnetronpentodetelevision-camera tube Parts circuit Part of anodecathodeelectrodegridplate WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.
