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Related to up quark: down quark
n. Abbr. u
The flavor of quark that has a charge of + 2/3 and a mass estimated at three to six times that of an electron, belongs to the first generation of elementary fermions, and is a component of nucleons and other hadrons.
the quark having electric charge ? times the electron's charge and together with the down quark being a constituent of nucleons.
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|Noun||1.||up quark - a stable quark with an electric charge of +2/3 and a mass 607 times that of an electron|
quark - (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; "quarks have not been observed directly but theoretical predictions based on their existence have been confirmed experimentally"