hadron UK /ˈhæd.ɹɒn/US /ˈhæd.ɹɑn/ noun1 •A composite particle that comprises two or more quarks held together by the strong force and (consequently) can interact with other particles via said force; a meson or a baryon.One can use the lattice simulations, which do represent the rigorous consequences of non-perturbative QCD, as guidance for models of hadron structure. — 2005 formshadrons