down quark 1
noundomain: natural obj.
Princeton WordNet [ver.3.1]
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EnglishDefinition
a stable quark with an electric charge of -1/3 and a mass 607 times that of an electron
Hypernym
quark 1
noun
(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
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