antielectron
noun
an·ti·elec·tron ˌan-tē-ə-ˈlek-ˌträn 
ˌan-ˌtī-
: positron
Example Sentences
Recent Examples on the Web For example, if an electron and an antielectron appear near the warp drive, one of the particles would get trapped by the mass and this results in an imbalance. 
Mario Borunda, The Conversation, 23 Apr. 2021 Positronium is a volatile, short-lived atom that seems kind of like hydrogen but has a positron—an antiparticle considered opposite to an electron, sometimes even called an antielectron—instead of a proton. Caroline Delbert, Popular Mechanics, 9 Dec. 2019 IsoDAR will take a small cyclotron and use it as a driver to produce lithium-8 that decays, resulting in a very pure source of antielectron neutrinos. Quanta Magazine, 8 Dec. 2016
Mario Borunda, The Conversation, 23 Apr. 2021 Positronium is a volatile, short-lived atom that seems kind of like hydrogen but has a positron—an antiparticle considered opposite to an electron, sometimes even called an antielectron—instead of a proton. Caroline Delbert, Popular Mechanics, 9 Dec. 2019 IsoDAR will take a small cyclotron and use it as a driver to produce lithium-8 that decays, resulting in a very pure source of antielectron neutrinos. Quanta Magazine, 8 Dec. 2016 Word History
First Known Use
1931, in the meaning defined above