1. 真空管,电子管：vacuum tube 真空管 | vacuum tube 真空管电子管 | vacuum valve 真空阀真空管
2. 真空泡：valve type lightning arrester-阀型避雷器 | vacuum tube-真空泡 | wave form-波形
noun
1. electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope
Synonym: tube thermionic vacuum tube thermionic tube electron tube thermionic valve