Thermionic-valve
noun, British.
1.
vacuum tube.
thermionic valve
noun
1.
an electronic valve in which electrons are emitted from a heated rather than a cold cathode
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noun 1. a mixture of finely-divided metallic aluminum and ferric oxide that when ignited produces extremely high temperatures as the result of the union of the aluminum with the oxygen of the oxide: used in welding, incendiary bombs, etc.
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