[kwawrk, kwahrk] 
| Physics. any of the hypothetical 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. Compare color (def. 18), flavor (def. 5), quantum chromodynamics, quark model. |
| quark 1 (kwôrk, kwärk) n. Any of a group of six elementary particles having electric charges of a magnitude one-third or two-thirds that of the electron, regarded as constituents of all hadrons. See Table at subatomic particle. [From Three quarks for Muster Mark!, a line in Finnegans Wake by James Joyce.] Word History: "Three quarks for Muster Mark!/Sure he hasn't got much of a bark/And sure any he has it's all beside the mark." This passage from James Joyce's Finnegans Wake, part of a scurrilous 13-line poem directed against King Mark, the cuckolded husband in the Tristan legend, has left its mark on modern physics. The poem and the accompanying prose are packed with names of birds and words suggestive of birds, and the poem is a squawk against the king that suggests the cawing of a crow. The word quark comes from the standard English verb quark, meaning "to caw, croak," and also from the dialectal verb quawk, meaning "to caw, screech like a bird." It is easy to see why Joyce chose the word, but why should it have become the name for a group of hypothetical subatomic particles proposed as the fundamental units of matter? Murray Gell-Mann, the physicist who proposed this name for these particles, said in a private letter of June 27, 1978, to the editor of the Oxford English Dictionary that he had been influenced by Joyce's words: "The allusion to three quarks seemed perfect" (originally there were only three subatomic quarks). Gell-Mann, however, wanted to pronounce the word with (ô) not (ä), as Joyce seemed to indicate by rhyming words in the vicinity such as Mark. Gell-Mann got around that "by supposing that one ingredient of the line 'Three quarks for Muster Mark' was a cry of 'Three quarts for Mister . . . ' heard in H.C. Earwicker's pub," a plausible suggestion given the complex punning in Joyce's novel. It seems appropriate that this perplexing and humorous novel should have supplied the term for particles that come in six "flavors" and three "colors." |
| quark 2 (kwôrk, kwärk) n. A soft creamy acid-cured cheese of central Europe made from whole milk. [German, from Middle High German quarc, from Lower Sorbian twarog, from Old Church Slavonic tvarogŭ.] |
| quark (kwôrk, kwärk) Pronunciation Key
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. See Note at elementary particle. See Table at subatomic particle. |