di·ode

[dahy-ohd]
noun Electronics.
a device, as a two-element electron tube or a semiconductor, through which current can pass freely in only one direction.

Origin:
1919; di-1 + -ode2

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
diode (ˈdaɪəʊd) [Click for IPA pronunciation guide]
 
n
1.  More formal name: semiconductor diode a semiconductor device containing one p-n junction, used in circuits for converting alternating current to direct current
2.  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
 
[C20: from di-1 + -ode²]

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Diode is always a great word to know.
So is bezoar. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
Etymonline
Word Origin & History

diode
1886, from Gk. di- "twice" + hodos "way" (see cede).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
diode   (dī'ōd')  Pronunciation Key 


(click for larger image in new window)

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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FOLDOC
Computing Dictionary

diode definition

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.
(1995-03-14)

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
The microcircuitry only is enough to support one light-emitting diode.
Electrons on one end of the diode tend to be in a high-energy state and at the
  other a low-energy state.
Same was said of gallium nitride, can't make a diode because of defects.
In a lidar gun, electronics ramp up battery power to high voltage that drives a
  laser diode.
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