- a short-lived entity consisting of a positron and an electron bound together. It decays by annihilation to produce two or three photons
| 单词 | positronium |
| 释义 | WordReference Random House Unabridged Dictionary of American English © 2024 pos•i•tro•ni•um (poz′i trō′nē əm),USA pronunciation n. [Physics.]
Collins Concise English Dictionary © HarperCollins Publishers:: positronium /ˌpɒzɪˈtrəʊnɪəm/ n
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