Up quark
WordNet
noun
(1) A stable quark with an electric charge of +2/3 and a mass 607 times that of an electron
WiktionaryText
Noun
- A quark having a fractional electric charge of +2/3 and a mass of about 1.5 to 4 MeV. Symbol: u
See also
- down quark
- charm quark
- strange quark
- top quark / truth quark
- bottom quark / beauty quark
- anti-up quark