- The muscle that permits the tongue to be held on the floor of the mouth.
* * *
* * *hyo·glos·sus -'gläs-əs, -'glȯs- n, pl -si -.sī a flat muscle on each side of the tongue connecting it with the body and the thyrohyal of the hyoid bone called also hyoglossus muscle
* * *n.a muscle that serves to depress the tongue. It has its origin in the hyoid bone.
Medical dictionary. 2011.