Usually means: Antiproton and proton bound state.
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We found 3 dictionaries that define the word protonium:

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  1. protonium: Wiktionary
  2. Protonium: Wikipedia, the Free Encyclopedia

Computing (1 matching dictionary)
  1. protonium: Encyclopedia

Definitions from Wiktionary (protonium)

noun:  (physics) An exotic atom consisting of a proton bound to an antiproton.

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