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triac

[trahy-ak] /ˈtraɪ æk/
noun, Electronics.
1.
a type of thyristor designed for electronic control of the current supplied to a circuit, used especially in dimmers for lighting systems.
Origin of triac
1960-1965
1960-65; tri(ode) + A.C. alternating current
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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