antiparticle

plural antiparticles · alternative anti-particle

1. particlenatural sciencesA subatomic particle corresponding to another particle with the same mass, spin and mean lifetime but with charge, parity, strangeness and other quantum numbers flipped in sign; a particle that has a reversed world line to another.

   There could be whole antiworlds and antipeople made out of antiparticles. However, if you meet your antiself, don't shake hands!

   1988, Stephen Hawking, A Brief History of Time: From the Big Bang to Black Holes, page 75

   1 more example

   Particles of matter and antimatter are identical, except for an opposite electrical charge. An electron has a negative charge whereas its antiparticle, the positron, has a positive charge, and both have an identical mass.

   2010 November 19, Alok Jha, “We can't see antimatter but it really does matter”, in The Guardian, →ISSN