1. (noun) electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope

• electron tube
• thermionic tube
• thermionic valve
• tube
• vacuum tube

1. (noun) electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope

• acorn tube
• diode
• rectifying tube
• rectifying valve
• electron multiplier
• gas-discharge tube
• klystron
• magnetron
• pentode
• television pickup tube
• television-camera tube
• tetrode
• triode
• x-ray tube

1. (noun) electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope

• electronic device