1) Electron 2) Lepton 1) Electron 2) Photoelectron 
Term used for an electron to emphasize its negative charge in contradistinction to the positive charge carried by the otherwise similar positron. ... (05 Mar 2000) ... 
(neg´ә-tron) a negatively charged electron.
Type: Term Pronunciation: neg′ă-tron Definitions: 1. Term used for an electron to emphasize its negative charge in contradistinction to the positive charge carried by the otherwise similar positron.
negatron An electron with a negative charge, as contrasted with a positron.