quark

American  

[kwawrk, kwahrk] / kwɔrk, kwɑrk /

noun

• quarks
  plural

1. Physics. any of the particles with spin 1/2, baryon number 1/3, and electric charge 1/3 or −2/3 that, together with their antiparticles, are believed to constitute all the elementary particles classed as baryons and mesons; they are distinguished by their flavors, designated as up (u), down (d), strange (s), charm (c), bottom or beauty (b), and top or truth (t), and their colors, red, green, and blue.

---

quark ¹ British  

/ kwɑːk /

noun

1. physics any of a set of six hypothetical elementary particles together with their antiparticles thought to be fundamental units of all baryons and mesons but unable to exist in isolation. The magnitude of their charge is either two thirds or one third of that of the electron

---

quark ² British  

/ kwɑːk /

noun

1. a type of low-fat soft cheese

---

quark Scientific  

/ kwôrk,kwärk /

1. Any of a group of elementary particles supposed to be the fundamental units that combine to make up the subatomic particles known as hadrons (baryons, such as neutrons and protons, and mesons). There are six different flavors (or types) of quark: up quark, down quark, top quark, bottom quark, charm quark, and strange quark. Quarks have fractional electric charges, such as 1/3 the charge of an electron.

2. See Note at elementary particle See Table at subatomic particle

---

Other Word Forms

Noun Inflected Forms

• quarks
  plural

Etymology

Origin of quark

Coined in 1963 by U.S. physicist Murray Gell-Mann (1929–2019), who associated it with a word in Joyce's Finnegans Wake, read variously as English quark croak and German Quark curd, (slang) rubbish, tripe

Explanation

A quark is an elementary particle with an electric charge. When quarks combine, they form another type of particle called a "hadron." If you want to learn more, take up particle physics. Quarks are held together by what physicists call "the strong force" or "the strong nuclear force." The most stable of these quark combinations, or hadrons, are protons and neutrons — the basic building blocks of atoms. In the 1960s, a physicist named Murray Gell-Mann named these particles from a favorite made-up word in James Joyce's book Finnegan's Wake: quark. Gell-Mann's partner reportedly preferred the word ace.

Example Sentences

See Examples For:

quark quarks

Normal protons have two "up" quarks and one "down" quark.

From Barron's ● Mar. 17, 2026

Does the entropy during the quark and gluon dominated phase of a proton collision differ from the entropy of the hadrons that later escape the collision zone?

From Science Daily ● Jan. 5, 2026

Throughout my career, I have used the quark test.

From The Wall Street Journal ● Nov. 6, 2025

The names for these speculative particles often tack on an S to the names of known particles: selectrons contrast electrons, the squark is the inverted twin of the quark, and so on.

From Salon ● Dec. 26, 2024

What happens is that a matter particle, such as an electron or a quark, emits a force-carrying particle.

From "A Brief History of Time: And Other Essays" by Stephen Hawking

When atomic nuclei crash into one another at nearly the speed of light, they briefly produce quark-gluon plasma, an extraordinarily hot state of matter in which quarks and gluons can move freely.

From Science Daily ● Aug. 3, 2026

This would include known particles like electrons, quarks and Higgs bosons, as well as hypothetical ones such as dark matter particles, and possibly entirely new forms of matter.

From Science Daily ● Apr. 8, 2026

Normal protons have two "up" quarks and one "down" quark.

From Barron's ● Mar. 17, 2026

In 2017, the LHCb experiment announced that it had discovered a similar particle, made of two "charmed" quarks and one "up" quark.

From Barron's ● Mar. 17, 2026

Luckily, grand unified theories may provide an explanation of why the universe should now contain more quarks than antiquarks, even if it started out with equal numbers of each.

From "A Brief History of Time: And Other Essays" by Stephen Hawking