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triac

[trahy-ak]
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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

1960–65; tri(ode) + A.C. alternating current
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018