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zener diode vs. diode

[zee-ner] / ˈzi nər /
Or Zener diode

noun

Electronics.
  1. a semiconductor diode across which the reverse voltage remains almost constant over a wide range of currents, used especially to regulate voltage.

[dahy-ohd] / ˈdaɪ oʊd /

noun

Electronics.
  1. a device, as a two-element electron tube or a semiconductor, through which current can pass freely in only one direction.