permatron
nounUK /ˈpɜː.məˌtɹɒn/ · US /ˈpɜɹ.məˌtɹɑn/
Etymology From a trade name. Blend of perma(nent) + -tron.
1
A hot-cathode rectifier with anode current controlled by magnetic field.
Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.