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up quark Twit Definition of up quark Share Definition of up quark on Facebook Digg:Definition of up quark! stumble Definition of up quark Bookmark Definition of up quark on Delicious submit Definition of up quark to reddit Bookmark Definition of up quark
noun 
  1. (particles) 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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         Source Definition of up quark
      

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