Adjective : The antineutron lobby was outnumbered.    From Dictionary.com. 

When an antineutron collides with a beryllium nucleus, it annihilates one neutron, and the mutual annihilation releases around nine times the energy of a fissioning uranium atom.    From Wordnik.com.  [Mother Of Storms]

The major region of administration by for the neutron and antineutron.    From Wordnik.com.  [Recently Uploaded Slideshows] Reference

The missiles penetrated the Arctic ice, and delivered antineutron-beryllium warheads -- or 'cram bombs' --- onto the sites you see here. ".    From Wordnik.com.  [Mother Of Storms]