down quark ( synonym found)
Definition of down quark:

(n) : a quark having a fractional electric charge of -1/3 and a mass about 4 to 8 MeV. Symbol: d
Definition of down quark:

(n) : a quark having a fractional electric charge of -1/3 and a mass about 4 to 8 MeV. Symbol: d
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