bituminate UK /bɪˈtjuːmɪneɪt/US /bəˈtuməneɪt/noun 1verb 1forms 3 noun1 •A substance that has been treated with bitumen. verb1 •To treat or impregnate with bitumen.Bituminated walls of Babylon. — 1623 formsbituminated · bituminating · bituminates