quadroon /kwɑːˈdɹuːn/adjective 1noun 1forms 1 adjective1 •(old-fashioned, historical) Of or related to quadroons.Before them, with her face upraised, In timid attitude, Like one half curious, half amazed, A Quadroon maiden stood. — 1842 noun1 •(old-fashioned, historical) A person considered three-fourths white, having one non-white grandparent. formsquadroons