To destroy or annihilate together; to reduce to nothing mutually or simultaneously.
From Latin co- (together) plus annihilate (from Medieval Latin 'annihilare', from 'ad-' (to) plus 'nihil' (nothing)). The co- prefix emphasizes mutual or simultaneous destruction.
In physics, coannihilate describes what happens when a particle meets its antiparticle—they simultaneously destroy each other in a burst of energy. It's mutual annihilation at the subatomic level, one of the most dramatic interactions possible.
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