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charmonium

American

[chahr-moh-nee-uhm] / tʃɑrˈmoʊ ni əm /

noun

Physics.

any meson composed of a charmed quark and a charmed antiquark.

charmonium British

/ tʃɑːˈməʊnɪəm /

noun

physics an elementary particle that contains an antiquark and a charm quark

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of charmonium

1970–75; charm ¹ + -onium, probably extracted from positronium

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charmonium

Hadrons containing a charm quark and its antimatter partner, an anti-charm quark, occupy a region of the hadron spectrum with similar masses known as charmonium.

From Science Daily ● Sep. 2, 2026

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023