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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 It has been replaced by the transistor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]


(ˈtraɪ oʊd)

a vacuum tube containing three elements, usu. anode, cathode, and control grid.
[1920–25; tri- + (electr) ode]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.triode - a thermionic vacuum tube having three electrodestriode - 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
electron tube, thermionic tube, thermionic vacuum tube, thermionic valve, vacuum tube, tube - electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope
References in periodicals archive ?
Tenders invited for Supply of Triode sputter ion pump
In 1906, an American engineer Lee de Forest introduced a third electrode to the EL in the form of a control metal grid and invented in this way an electrovacuum triode shown below in Fig.
Triode electrodes placed on vastus lateralis (VL), gastrocnemius (GN), and gluteus maximus(GM) recorded muscle activity during squats.
This multi feedback ring oscillator can correctly control output swing, although it has a disadvantage that the power noise characteristic is bad because an output is linked to a power line directly through a small impedance triode transistor.
Blood meant for triode hormone detection (total triiodothyronine, total thyroxin, and thyrotropin-stimulating hormone) were collected into tubes without EDTA.
Triacs (short for triode for alternating current) make up the heart of AC light dimming controls.
Aerodist master units essentially comprised: a klystron oscillator that set the carrier signal frequency that allowed voice communication with remote units, and later broadcast the measuring pattern frequency signals; a triode power amplifier that amplified carrier and measuring signals for transmission through the aircraft antenna system; and ovens for the crystals that determined the pattern frequencies that were automatically switched over the carrier frequency to give the measuring signals for relevant distant components.
213) A competing innovator, Lee De Forest, threatened Marconi's position by developing the triode valve (a three-element vacuum tube), marketed as the "Audion" device and protected by various patents.
He first introduced his (now famous) equation in order to describe triode oscillations in electric circuits, in 1927.
The model of the triode is the functional analogy [analogue fonctionnel] of a social structure.
The area improvement is achieved due to the use of a power transistor biased in the triode region.
Thermo Scientific Orion ROSS Ultra Triode electrodes couple pH measurement stability with automated temperature control and are now available with RCA connectors on the integrated temperature probe, making them a convenient solution for routine sample measurements or challenging research applications.