English dictionary

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English *noun*: thermionic valve
1.	thermionic valve (artifact) electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope
		Synonyms	electron tube, thermionic tube, thermionic vacuum tube, tube, vacuum tube
		Broader (hypernym)	electronic device
		Narrower (hyponym)	acorn tube, diode, electron multiplier, gas-discharge tube, klystron, magnetron, pentode, rectifying tube, rectifying valve, television pickup tube, television-camera tube, tetrode, triode, X-ray tube
		Part holonym	anode, cathode, control grid, electrode, grid, plate
		Part meronym	circuit, electric circuit, electrical circuit

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