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Từ điển Oxford Learners Wordfinder Dictionary
thermionic valve


noun
electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope
Syn:
tube, vacuum tube, thermionic vacuum tube, thermionic tube, electron tube
Hypernyms:
electronic device
Hyponyms:
acorn tube, diode, rectifying tube, rectifying valve, electron multiplier,
gas-discharge tube, klystron, magnetron, pentode, television-camera tube, television pickup tube,
tetrode, triode, X-ray tube
Part Holonyms:
circuit, electrical circuit, electric circuit
Part Meronyms:
anode, cathode, electrode, grid, control grid, plate


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