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[dahy-ohd] /ˈdaɪ oʊd/
noun, Electronics.
a device, as a two-element electron tube or a semiconductor, through which current can pass freely in only one direction.
Origin of diode
1919; di-1 + -ode2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for diode
  • It wasn't long before he could tune the cheap diode lasers nearly as accurately as standard lasers.
  • In a lidar gun, electronics ramp up battery power to high voltage that drives a laser diode.
  • The diode emits infrared laser pulses every five milliseconds.
  • diodes block current in one direction, and running them in series divides the voltage each diode sees.
  • Electrons on one end of the diode tend to be in a high-energy state and at the other a low-energy state.
  • Typically, a microwave antenna with a diode is able to capture the energy.
  • At the heart of the silicon modulator design is a diode, similar to those found in electronics.
  • The microcircuitry only is enough to support one light-emitting diode.
  • Possibly, a coherent beam could drive a laser diode.
  • Same was said of gallium nitride, can't make a diode because of defects.
British Dictionary definitions for diode


a semiconductor device containing one p-n junction, used in circuits for converting alternating current to direct current More formal name semiconductor diode
the earliest and simplest type of electronic valve having two electrodes, an anode and a cathode, between which a current can flow only in one direction. It was formerly widely used as a rectifier and detector but has now been replaced in most electrical circuits by the more efficient and reliable semiconductor diode
Word Origin
C20: from di-1 + -ode²
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for diode

1886, from Greek di- "twice" + hodos "way" (see cede).

Online Etymology Dictionary, © 2010 Douglas Harper
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diode in Science

An electrical device with two active terminals, an anode and a cathode, through which current passes more easily in one direction (from anode to cathode) than in the reverse direction. Diodes have many uses, including conversion of AC power to DC power, and the decoding of audio-frequency signals from radio signals.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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diode in Technology

hardware, electronics
A semiconductor device which conducts electric current run in one direction only. This is the simplest kind of semiconductor device, it has two terminals and a single PN junction. One diode can be used as a half-wave rectifier or four as a full-wave rectifier.

The Free On-line Dictionary of Computing, © Denis Howe 2010
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