(Falkland Islands, informal) The black-crowned night heron, Nycticorax nycticorax.

A soft creamy cheese, eaten throughout northern, central, eastern, and southeastern Europe as well as the Low Countries, very similar to cottage cheese except that it is usually not made with rennet.

(physics) In the Standard Model, an elementary subatomic particle that forms matter. They combine to form hadrons, such as protons and neutrons.

plural of quark

(physics, dated) Synonym of top quark.

(physics, dated) Synonym of bottom quark.

(physics) A quark having a fractional electric charge of -1/3 and a mass of about 4,100 to 4,400 MeV. / Symbol: b

(physics) A quark having a fractional electric charge of +2/3 and a mass of about 178,000 MeV. / Symbol: t

(physics) A quark having a fractional electric charge of -1/3 and a mass of about 80 to 130 MeV. / Symbol: s

(physics) A quark having a fractional electric charge of +2/3 and a mass of about 1150 to 1350 MeV. / Symbol: c