pos·i·tro·ni·um (p z  -tr  n - m)n. A short-lived association of an electron and a positron bound together in a configuration resembling the hydrogen atom. |
positronium [ˌpɒzɪˈtrəʊnɪəm]
n
(Physics / Atomic Physics) Physics a short-lived entity consisting of a positron and an electron bound together. It decays by annihilation to produce two or three photons
[from positron + -ium]
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