charmonium

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Related to charmonia: charmonium

char·mo·ni·um

 (chär-mō′nē-əm)
n.
Any of various elementary particles consisting of a charm quark and an antiquark.

[From charm.]

charmonium

(tʃɑːˈməʊnɪəm)
n, pl -nia
(Atomic Physics) physics an elementary particle that contains an antiquark and a charm quark
[C20: from charm (sense 7)]