quark.n.01

'quark.n.01'

[quark.n.01] as in: (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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Examples:
quarks have not been observed directly but theoretical predictions based on their existence have been confirmed experimentally