The Collaborative International Dictionary
geniohyoid
geniohyoid \ge`ni*o*hy"oid\ (j[=e]`n[i^]*[-o]*h[imac]"oid), a. [Gr. ge`neion the chin + E. hyoid.] (Anat.) Of or pertaining to the chin and hyoid bone; as, the geniohyoid muscle.
Wiktionary
geniohyoid
a. (context anatomy English) Of or pertaining to the chin and hyoid bone. n. (context anatomy English) A narrow muscle situated superior to the medial border of the mylohyoid muscle.