Definition of antineutron in US English:

antineutron

noun

Physics
  • The antiparticle of a neutron.

    • ‘Antimatter is matter composed of antiparticles, such as positrons, antineutrons and antiprotons.’
    • ‘The antineutron, although neutral like the neutron, is distinguishable from the neutron because it is composed of two anti-down quarks and one anti-up quark.’
    • ‘One can imagine atoms that are made of antiparticles: antiprotons, antineutrons, and positrons.’
    • ‘Antimatter also exists and so there is an antiproton, an antineutron and an antielectron often called the positron.’
    • ‘The antineutron contains one anti-up quark and two anti-down quarks, giving it a charge of 0, just like the regular neutron.’

Pronunciation