quark Meaning, Definition & Usage

1. noun (physics) hypothetical truly fundamental particle in mesons and baryons; there are supposed to be six flavors of quarks (and their antiquarks), which come in pairs; each has an electric charge of +2/3 or -1/3
   
   • quarks have not been observed directly but theoretical predictions based on their existence have been confirmed experimentally
2. noun fresh unripened cheese of a smooth texture made from pasteurized milk, a starter, and rennet
   quark cheese.
   

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