The antiparticle counterpart to a neutron; a subatomic particle with the same mass as a neutron but opposite properties that would annihilate if it meets a regular neutron.
From anti- + neutron (an uncharged subatomic particle). This physics term emerged in the 1950s as scientists discovered antimatter particles corresponding to regular matter particles.
When an antineutron meets a neutron, they don't just disappear quietly—they annihilate in an explosion of pure energy, and this is exactly how scientists theorize antimatter could become a super-powerful fuel source (if we could contain it safely).
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