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quarkonium

[kwawr-koh-nee-uh m, kwahr-]
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noun Physics.
  1. a meson composed of a quark and an antiquark of the same flavor.

Origin of quarkonium

1975–80; quark + -on1 + -ium, on the model of positronium and similarly named particles
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
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