1. (

• quark

) (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. (

• quark_cheese ,
• quark

) fresh unripened cheese of a smooth texture made from pasteurized milk, a starter, and rennet ;