Noun[edit] malapropism â(plural malapropisms) (uncountable) The blundering use of an absurdly inappropriate word or expression in place of a similar-sounding one.
Definition of positron. : a positively charged particle having the same mass and magnitude of charge as the electron and constituting the antiparticle of the electron âcalled also antielectron.
Beta-plus (Î² +) radiation is the emission of positrons, which are the antimatter form of electrons. When a positron slows to speeds similar to those of electrons in the material, the positron will annihilate an electron, releasing two gamma photons of 511 keV in the process.