: any of several elementary particles that are postulated to come in pairs (as in the up and down varieties) of similar mass with one member having a charge of +²/₃ and the other a charge of −¹/₃ and are held to make up hadrons

Did you know?

If you were a physics major, chances are that James Joyce didn’t make it onto your syllabus. While literature majors are likely more familiar with his work, Joyce has a surprising tie to physics. In the early 1960s, American physicist Murray Gell-Man came up with the word quork, which he used to refer to his concept of an elementary particle smaller than a proton or neutron (by his own account he was in the habit of using names like “squeak” and “squork” for peculiar objects). He later settled on the spelling quark after reading a line from James Joyce’s Finnegans Wake: “Three quarks for Muster Mark! / Sure he has not got much of a bark / And sure any he has it’s all beside the mark.” The name stuck and has been used by physicists ever since.

Examples of quark in a Sentence

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The photon and the gluons of the Standard Model are massless, whereas the massive Standard Model particles range from the electron, at about half-an-MeV, to the top quark, at 173 GeV. Big Think, 28 Oct. 2025 Gluons carry the strong nuclear force, which glues together fundamental particles called quarks to make protons and neutrons. Stephanie Pappas, Scientific American, 27 Oct. 2025 The relation is derived partially from the principles of quantum chromodynamics, or QCD, which is the theory of how the strong force binds particles called quarks to form particles such as neutrons. Keith Cooper, Space.com, 24 Oct. 2025 The universe is overwhelmingly made of matter, which is responsible for visible structures ranging from atoms to galaxies, and quarks to quasars. Chris Young, Interesting Engineering, 23 Oct. 2025 See All Example Sentences for quark

Word History

Etymology

coined by Murray Gell-Mann

First Known Use

1964, in the meaning defined above

Time Traveler
The first known use of quark was in 1964

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Cite this Entry

“Quark.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/quark. Accessed 3 Nov. 2025.

Kids Definition

quark

noun
: any of several particles that are believed to be components of heavier particles (as protons or neutrons)

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