Idahonian UK /ˌaɪ.dəˈhəʊ.ni.ən/US /ˌaɪ.dəˈhoʊ.ni.ən/adjective 1noun 1forms 3 adjective1 •Of or relating to the American state of Idaho. noun1 •A native or inhabitant of the American state of Idaho. formsIdahonians · more Idahonian · most Idahonian