Quark

[kwɑːk;kwɔːk] or [kwɑrk]

Definition

(noun.) (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'.

Editor: Thea--From WordNet