Houstonian UK /hjuːˈstəʊ.ni.ən/US /h(j)uˈstoʊ.ni.ən/adjective 1noun 1forms 3 adjective1 •Of or relating to Houston.The Houstonian Hotel, President Bush's nominal Texas residence, is in bankruptcy. — 1992 noun1 •A native or inhabitant of Houston. formsHoustonians · more Houstonian · most Houstonian