up quark ( synonym found)
Definition of up quark:

(n) : a quark having a fractional electric charge of +2/3 and a mass of about 1.5 to 4 MeV. Symbol: u
Definition of up quark:

(n) : 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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