genio-|dʒɪˈnaɪəʊ|combining form of Gr. γένειον (see genial a.2), occurring in several anatomical combinations in the sense of pertaining to the chin or lower jaw and some other member. † genioglosse (in 7 geneo-), a muscle of the tongue, connected with the chin and hyoid bone [mod.L. genioglossus, F. genioglosse]; so geˈnio-glossala.[see glossal]= next. geˌnioˈhyoglossala.[see hyoglossal], pertaining to the chin, the hyoid bone, and the tongue. geˌnio-ˈhyoida.[see hyoid], pertaining to the chin and to the hyoid bone; also absol.quasi-n.=genio-hyoid muscle. geˌnio-ˈmentala.[see mental2], pertaining to the lower jaw and the chin.1669Holder Elem. Speech 49 The Tongue being held in that posture, onely by the force of the Geneoglosse, or Myleoglosse Muscles.1848Quain's Elem.Anat. (ed. 5) I. 273 The genio-hyoid muscle.1873Mivart Elem.Anat. 287 The genio-hyoid is narrow, and goes from the hyoid to the mandible inside the symphysis.1885Syd. Soc.Lex., Geniohyoid nerve, a branch given off by the hypoglossal nerve as it lies beneath the mylohyoid muscle.1890H. Ellis Criminal iii. 72 The relative frequency is especially marked in zygomatic and genio-mental wrinkles.
genio-/dʒɪˈnʌɪəʊ/combining form of Greek geneion chin: see genialadjective2, -o-.
genio- combining form Etymology: International Scientific Vocabulary, from Greek geneio-, from geneion chin, beard — more at genial 1.: chin < genioplasty > 2.: chin and < genioglossal >