(physics) The antimatter equivalent of an electron, having the same mass but a positive charge

Of or pertaining to positrons. / (science fiction) Of or pertaining to a supposed analogue of electronics using positrons

plural of positron

(medicine) A medical imaging technique which detects the gamma rays produced by positrons emitted from injected radionuclides.

plural of positron emission tomography

plural of positronium

(physics, chemistry) An exotic atom (specifically, an onium) consisting of a positron (anti-electron) and an electron, as a particle–anti-particle bound pair with no nucleus.

plural of positronium