quarkonium

 [kwawr-koh-nee-uhm, kwahr-]  

quar·ko·ni·um

   [kwawr-koh-nee-uhm, kwahr-]
noun Physics.
a meson composed of a quark and an antiquark of the same flavor.
Origin:
1975–80; quark + -on1 + -ium, on the model of positronium and similarly named particles
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Quarkonium is always a great word to know.
So is fission. Does it mean:
the splitting of the nucleus of an atom into nuclei of lighter atoms, accompanied by the release of energy
a wave in which the direction of displacement is perpendicular to the direction of propagation, as a surface wave of water
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