Etymology
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diode (n.)

1919, in electricity, "tube with two electrodes," from Greek di- "twice" (from dis "twice," related to duo, from PIE root *dwo- "two") + hodos "a way, path, track, road," a word of uncertain origin (see Exodus).

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Definitions of diode

diode (n.)
a thermionic tube having two electrodes; used as a rectifier;
Synonyms: rectifying tube / rectifying valve
diode (n.)
a semiconductor that consists of a p-n junction;
Synonyms: semiconductor diode / junction rectifier / crystal rectifier
From wordnet.princeton.edu