antinucleon
/ˌæntiˈnukliˌɑn/
noun
- The antiparticle of a nucleon (proton or neutron), having the same mass but opposite charge.
- The existence of antinucleons was predicted by the theory of antimatter.
- Scientists observed antinucleons in high-energy particle collisions at the accelerator.
- In particle physics, an antinucleon can annihilate with a nucleon, releasing energy.