"quark" in the noun sense
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
Source: WordNet® (An amazing lexical database of English)
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