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charmonium

[chahr-moh-nee-uh m]
noun Physics.
  1. any meson composed of a charmed quark and a charmed antiquark.
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Origin of charmonium

1970–75; charm1 + -onium, probably extracted from positronium
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for charmonium

charmonium

noun plural -nia
  1. physics an elementary particle that contains an antiquark and a charm quark
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Word Origin

C20: from charm (sense 7)
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