WordReference Random House Unabridged Dictionary of American English © 2025
quark′ mod′el, [Physics.]
            - Physicsa scheme that explains the quantum numbers of all the baryons and mesons by assuming that baryons are composed of three quarks and mesons of a quark and an antiquark, with different combinations of quark and antiquark flavors giving different sets of quantum numbers.
'quark model' also found in these entries (note: many are not synonyms or translations):