Definition of quark noun from the Oxford Advanced Learner's Dictionary



    BrE BrE//kwɑːk//
    ; NAmE NAmE//kwɑːrk//
    Molecules and matter
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  1. 1 [countable] (physics) a very small part of matter (= a substance). There are several types of quark and it is thought that protons, neutrons, etc. are formed from them. See related entries: Molecules and matter
  2. 2 [uncountable] a type of soft cheese from central Europe, similar to curd cheese
  3. Word Origin1960s: a word invented by Murray Gell-Mann, the American theoretical physicist. Originally quork, the term was changed by association with the line “Three quarks for Muster Mark” in Joyce's Finnegans Wake (1939).
See the Oxford Advanced American Dictionary entry: quark