Definitions for quarkkwɔrk, kwɑrk
Random House Webster's College Dictionary
any of a group of subatomic particles having a fractional electric charge and thought to constitute, together with their antiparticles, all baryons and mesons.
Origin of quark:
coined in 1963 by U.S. physicist Murray Gell-Mann (b. 1929), who associated it with a word in Joyce's Finnegans Wake
(physics) hypothetical truly fundamental particle in mesons and baryons; there are supposed to be six flavors of quarks (and their antiquarks), which come in pairs; each has an electric charge of +2/3 or -1/3
"quarks have not been observed directly but theoretical predictions based on their existence have been confirmed experimentally"
quark cheese, quark(noun)
fresh unripened cheese of a smooth texture made from pasteurized milk, a starter, and rennet