Meaning of THYRISTOR in English
any of several types of transistor having four semiconducting layers and therefore three pn junctions; the thyristor is a solid-state analogue of the thyratron (q.v.) vacuum tube. A common form of thyristor is the silicon-controlled rectifier (SCR), widely used as a component of devices that control motor speeds, liquid levels, temperatures, and pressures.
Britannica English vocabulary. Английский словарь Британика. 2012