Entry 1 sense Webster, 1913 geniohyoid /(jē`nĭ*ō̇*hī"oid)/ · ge·ni·o·hy·oid · IPA /ˌd͡ʒi.ni.oʊˈhaɪˌɔɪd/ 01 a. Of or pertaining to the chin and hyoid bone; as, the geniohyoid muscle. 1. Of or pertaining to the chin and hyoid bone; as, the geniohyoid muscle.(Anat.)