- (particles) In the Standard Model, an elementary subatomic particle which forms matter. Quarks are never found alone in nature and combine to form hadrons, such as protons and neutrons.
- 1993: Gell-Mann won the linguistic battle once again: his choice, a croaking nonsense word, was "quark". (After the fact, he was able to tack on a literary antecedent when he found the phrase "Three quarks for Muster Mark" in Finnegans Wake, but the physicists quark was pronounced from the beginning to rhyme with "cork".) — w:James Gleick, James Gleick, Genius: Richard Feynman and Modern Physics
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