In particle physics, the antimatter equivalent of a meson (a subatomic particle made of a quark and antiquark pair).
From anti- + meson, where meson comes from Greek 'mesos' (middle). The term emerged in 1930s-40s particle physics when scientists discovered antimatter and needed names for antimatter versions of known particles.
Antimuons are mind-bending: when a meson and antimeson meet, they annihilate each other completely, converting all their mass into pure energy according to E=mc²! This is the only process that converts matter entirely to energy, and it's how physicists might eventually power interstellar ships.
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