top quark

English Thesaurus

1. a hypothetical quark with a charge of +2/3 and a mass more than 100,000 times that of an electron (noun.object)

hypernym	:	quark,
definition	:	(physics) hypothetical truly fundamental particle in mesons and baryons; there are supposed to be six flavors of quarks (and their antiquarks), which come in pairs; each has an electric charge of +2/3 or -1/3 (noun.object)