geniohyoideus /jē′nē·ōhī·oi″dē·əs/ [Gk, genion, chin, hyoides, Y-shaped] , one of the four suprahyoid muscles that draw the hyoid bone and the tongue forward. Also called geniohyoid muscle. Compare digastricus, mylohyoideus, stylohyoideus. See also suprahyoid muscles.