一種假設的素粒子
quark n 1: 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 2: fresh unripened cheese of a smooth texture made from pasteurized milk, a starter, and rennet [syn: {quark cheese}]