geniohyoid UK /ˌd͡ʒiː.ni.ə(ʊ)ˈhʌɪ.ɔɪd/US /ˌd͡ʒi.ni.oʊˈhaɪˌɔɪd/adjective 2noun 1forms 1 adjective2 •Of or pertaining to the chin and hyoid bone. •Of or pertaining to the geniohyoid muscle. noun1 •Ellipsis of geniohyoid muscle. formsgeniohyoids