top quark is a noun meaning "a hypothetical quark with a charge of +2/3 and a mass more than 100,000 times that of an electron". It carries one recorded sense.
a hypothetical quark with a charge of +2/3 and a mass more than 100,000 times that of an electron
Definitions, synonyms and semantic relations for top quark come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.