varistor

[va-ris-ter, vuh-]
noun Electricity.
a resistor whose resistance automatically varies in proportion to the voltage of the current through it.

Origin:
1940–45; var(iable) + (res)istor

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World English Dictionary
varistor (vəˈrɪstə)
 
n
Compare varactor a two-electrode semiconductor device having a voltage-dependent nonlinear resistance
 
[C20: a blend of variable resistor]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The electronics of the transient protectors shall utilize a metal oxide varistor for each pole.
Varistor substrate with surface conduction between runs.
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