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Any of the point particles proposed as a constituent of hadrons, now known as quarks.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(General Physics) physics a hypothetical elementary particle postulated as a constituent of neutrons and protons
[from part + -on]
(Biography) Dolly. born 1946, US country and pop singer and songwriter
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014