heavy particle

Science Dictionary
heavy particle  
A subatomic particle with relatively high mass, especially a baryon.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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WordNet
heavy particle

noun
any of the elementary particles having a mass equal to or greater than that of a proton and that participate in strong interactions; a hadron with a baryon number of +1 [syn: baryon
WordNet® 3.0, © 2006 by Princeton University.
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