The story
From Ancient Greek θύρα (thúra, “door”) + -tron. Originally a trademark, registered 17 June 1930 by the General Electric Company (United States Patent Office, Registration No. 271-660).
Etymology from Wiktionary, CC BY-SA 4.0.
thyratron
Today it means: Any of several types of thermoelectric valve once used as a high-speed switch Full definition →