noun Electronics, Computers.
a cryogenic device that uses the principle that a varying magnetic field can cause the resistance of a superconducting element to change rapidly between its high normal and low superconductive values: used as a switch and as a computer-memory element.

1955–60; cryo- + -tron Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
cryotron (ˈkraɪəˌtrɒn)
a miniature switch working at the temperature of liquid helium and depending for its action on the production and destruction of superconducting properties in the conductor

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences for cryotron
The cryotron is a switch that operates using superconductivity.
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