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Definition of Down quark
1. Noun. A stable quark with an electric charge of -1/3 and a mass 607 times that of an electron.
Generic synonyms: Quark
Definition of Down quark
1. Noun. A quark having a fractional electric charge of -1/3 and a mass about 4 to 8 MeV. Symbol: d ¹
¹ Source: wiktionary.com