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quarkonium

[kwawr-koh-nee-uh m, kwahr-] /kwɔrˈkoʊ ni əm, kwɑr-/
noun, Physics.
1.
a meson composed of a quark and an antiquark of the same flavor.
Origin
1975-1980
1975-80; quark + -on1 + -ium, on the model of positronium and similarly named particles
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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