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An electron tube used mostly for signal amplification, consisting of a cathode, an anode, and an intervening wire mesh called a control grid.
1. (Electronics) an electronic valve having three electrodes, a cathode, an anode, and a grid, the potential of the grid controlling the flow of electrons between the cathode and anode. It has been replaced by the transistor
2. (Electronics) any electronic device, such as a thyratron, having three electrodes
[C20: tri- + electrode]
a vacuum tube containing three elements, usu. anode, cathode, and control grid.
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|Noun||1.||triode - a thermionic vacuum tube having three electrodes; fluctuations of the charge on the grid control the flow from cathode to anode which makes amplification possible|