positron

noun

Etymology: From positive + -tron (electron). Coined by American physicist Carl Anderson in 1932 to replace the earlier term antielectron.

1. The antimatter equivalent of an electron, having the same mass but a positive charge.

   “The notion of a positron weapon remains the stuff of science fiction.”

   “If these particles carry unit positive charge the curvatures and ionizations produced require the mass to be less than twenty times the electron mass. These particles will be called positrons.”