In particle physics, quarkonium (from quark + onium, pl. quarkonia) designates a flavorless meson whose constituents are a quark and its own antiquark. Examples of quarkonia are the J/ψ meson (an example of charmonium, {SubatomicParticle|Charm quark|link=yes}{SubatomicParticle|Charm antiquark|link=yes}) and the Upsilon}} meson (bottomonium, {Suba...
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http://en.wikipedia.org/wiki/Quarkonium
meson formed of a quark and an anti-quark
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http://phrontistery.info/q.html
a meson composed of a quark and an antiquark of the same flavor.
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https://www.infoplease.com/dictionary/quarkonium
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