One of the mysteries of the English language finally explained.
1Electronics. A valve with negative resistance, having an anode on one side of the cathode and a second anode and a control grid on the other side. Now historical.
2Physics. An ordinary negatively charged electron (as distinct from a positron). Compare "negaton". Now disused.
Early 20th century. From nega- + -tron.
In this article we explore how to impress employers with a spot-on CV.