1. The antiparticle counterpart of a neutrino, produced in certain radioactive decay processes and having nearly zero mass and no electric charge.
Usage: physics; technical

Examples

• Beta decay produces an electron and an antineutrino.
• Scientists detect antineutrinos from nuclear reactors to monitor their operation.
• The antineutrino is the antimatter equivalent of the neutrino.
• Antineutrinos interact so weakly with matter that they rarely collide with atoms.
• The discovery of antineutrinos confirmed predictions of particle physics theory.