noun Electronics.
a vacuum tube containing three elements, usually anode, cathode, and control grid.

1920–25; tri- + (electr)ode Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
triode (ˈtraɪəʊd)
1.  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 It has been replaced by the transistor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.  any electronic device, such as a thyratron, having three electrodes
[C20: tri- + electrode]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
triode  [%PREMIUM_LINK%]     (trī'ōd')  Pronunciation Key 
An electron tube used mostly for signal amplification, consisting of a cathode and anode (or plate) as in a diode, and an intervening wire mesh called the control grid. With little voltage on the grid, large currents can flow between the cathode and plate, but small variations in the voltage on the grid cause large variations in this current, allowing for large amplification of a signal applied to the control grid. See also pentode, tetrode.

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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica


electronelectron tube consisting of three electrodes-cathode filament, anode plate, and control grid-mounted in an evacuated metal or glass container. It has been used as an amplifier for both audio and radio signals, as an oscillator, and in electronic circuits. Currently, small glass triodes are used primarily in low-distortion audio amplifiers, while larger triodes, made of metal-ceramics for ruggedness, are used in radio transmitters and in the generation of radio frequency for industrial heating applications

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The plant continues to utilize the original design of a tetrode driving a super power triode.
It is all solid state, except for the triode transmitter, to provide a reliable product with extremely long operating life.
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