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quark1 British & World English

Any of a number of subatomic particles carrying a fractional electric charge, postulated as building blocks of the hadrons. Quarks have not been directly observed but theoretical predictions based on their existence have been confirmed experimentally

quark2 British & World English

A type of low-fat curd cheese

top quark British & World English

A quark with a mass of about 340,000 times that of an electron and a charge of +23

quark-gluon plasma British & World English

A hypothetical, highly energized form of matter that contains unbound quarks and gluons, believed to have been present ten millionths of a second after the Big Bang

antiquark British & World English

The antiparticle of a quark