bioterrorist UK /baɪ.əʊˈtɛ.ɹə.ɹɪst/US /baɪ.oʊˈtɛ.ɹə.ɹɪst/adjective 1noun 1forms 1 adjective1 •Of or relating to a bioterrorist or bioterrorism. noun1 •One who engages in bioterrorism; a terrorist employing biological weapons. formsbioterrorists