Usually means: Bound state of quark-antiquark pair.
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We found 11 dictionaries that define the word onium:

General (7 matching dictionaries)
  1. -onium, onium: Merriam-Webster
  2. onium: Wordnik
  3. -onium, onium: Wiktionary
  4. -onium: Webster's New World College Dictionary, 4th Ed.
  5. -onium: Infoplease Dictionary
  6. ONIUM, -onium, onium: Dictionary.com
  7. Onium: Wikipedia, the Free Encyclopedia

Computing (1 matching dictionary)
  1. -onium: Encyclopedia

Medicine (2 matching dictionaries)
  1. onium: Merriam-Webster Medical Dictionary
  2. -onium: Medical dictionary

Miscellaneous (1 matching dictionary)
  1. ONIUM: Acronym Finder

Definitions from Wiktionary (onium)

noun:  (chemistry) any cation derived by the addition of a proton to the hydride of any element of the nitrogen, chalcogen or halogen families
noun:  (chemistry) any organic derivative of these compounds
noun:  (physics) The bound pair of a particle and its antiparticle.

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