quark

noun /kwɔːk,kwɑːk,kwɔɻk,kwɑɻk/

a) 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".) — , Genius: Richard Feynman and Modern Physics

b) a soft creamy cheese. The Russian quark and Finnish quark are somewhat different. The Russian version is firmer in consistency and contains about 15% milk fat, whereas the Finnish quark often contains less than 1% milk fat.