Claytonian UK /kleɪˈtəʊ.ni.ən/US /kleɪˈtoʊ.ni.ən/adjective 1noun 1forms 3 adjective1 •Of or relating to any of the places called Clayton. noun1 •A native or inhabitant of any of the places called Clayton. formsClaytonians · more Claytonian · most Claytonian