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charmonium

[chahr-moh-nee-uh m] /tʃɑrˈmoʊ ni əm/
noun, Physics.
1.
any meson composed of a charmed quark and a charmed antiquark.
Origin
1970-1975
1970-75; charm1 + -onium, probably extracted from positronium
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for charmonium

charmonium

/tʃɑːˈməʊnɪəm/
noun (pl) -nia
1.
(physics) an elementary particle that contains an antiquark and a charm quark
Word Origin
C20: from charm (sense 7)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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