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varactor

[vuh-rak-ter] /vəˈræk tər/
noun
1.
a semiconductor diode whose capacitance changes to match applied voltage, used to tune circuits by varying the reactance.
Origin of varactor
1955-1960
1955-60; var(iable re)actor
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for varactor

varactor

/ˈvɛəˌræktə/
noun
1.
a semiconductor diode that acts as a voltage-dependent capacitor, being operated with a reverse bias Compare varistor
Word Origin
C20: probably a blend of variable reactor
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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