Definitions for up quark
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Random House Webster's College Dictionary
up′ quark`(n.)
the quark having electric charge ? times the electron's charge and together with the down quark being a constituent of nucleons.
Category: Physics
Origin of up quark:
1975–80
Princeton's WordNet
up quark(noun)
a stable quark with an electric charge of +2/3 and a mass 607 times that of an electron
Wiktionary
up quark(Noun)
A quark having a fractional electric charge of +2/3 and a mass of about 1.5 to 4 MeV. Symbol: u
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