THERMIONIC VACUUM TUBE

WordNet Dictionary

	Definition:	[n] electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope

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	Synonyms:	electron tube, thermionic tube, thermionic valve, tube, vacuum tube

	See Also:	acorn tube, anode, cathode, circuit, control grid, diode, electric circuit, electrical circuit, electrode, electron multiplier, electronic device, gas-discharge tube, grid, klystron, magnetron, pentode, plate, rectifying tube, rectifying valve, television pickup tube, television-camera tube, tetrode, triode, X-ray tube