antineutron

noun Physics.

1. an elementary particle having no charge and having a mass and spin equal to that of the neutron but with magnetic moment opposite to that of the neutron; the antiparticle of the neutron.

adjective

2. Also an·ti-neu·tron. opposing the building, stockpiling, or use of neutron bombs: The antineutron lobby was outnumbered.

noun

1. the antiparticle of a neutron; a particle having the same mass as the neutron but a magnetic moment of opposite sign

1. The antiparticle that corresponds to the neutron.