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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.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


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 It has been replaced by the transistor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]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈtraɪ oʊd)

a vacuum tube containing three elements, usu. anode, cathode, and control grid.
[1920–25; tri- + (electr) ode]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
Tube compliments are four EC88/6DL4 single triodes, two 5670 and 5U4G rectifier outboard power supply.
Thus, the Academy's physicists in the 20th century carried out a number of important scientific studies in the field of theoretical and experimental physics, as well as in the study of the physical properties of semiconductors (for example, germanium diodes and triodes) [1, 4].
Kurokawa, "Construction of an all-optical flip-flop by combination of two optical triodes," Applied Physics Letters, vol.
While it would be difficult to pin down an invention date for semiconductors (writ large), it is somewhat easier to identify dates of invention for specific developments in the field, such as the transitions from diodes to triodes to transistors.
He had five bingos (for non-players, a bingo is when a player uses up all 7 allotted letters and is rewarded with an automatic 50 points), including 'encodes', 'seasing', 'taborin', 'valider' and 'triodes'.
(355) For example, comparing these metrics between diodes and triodes, or between traditionally purified EPO and recombinant EPO, can provide useful indications of the relative value of an improved technology over a basic patented invention.
The cooling system of the triodes is made up of a double water circuit; it is designed to allow the longest possible life of the triodes and does not requir periodic maintenance operations.
The most prolific telegraph-radio inventor, Harry Shoemaker, devised mechanisms improving the de Forest triodes and a wide variety of other wireless improvements for a number of companies.
Morgan, the European Investment Bank, the IFC, KfW, Triodes Bank, ACCION International and the Omidyar Network, the philanthropic investment firm of Pierre Omidyar, founder of eBay.
From 1985 to the present, he has also employed the schematic imagery of classical electronics--resistors, capacitors, batteries, ground, coils, lamps, switches, plus diodes, triodes, pentodes--in pseudo-circuits that link figures.