• (a.) Within the tongue; -- applied to the glossohyal bone.
En`to·glos'sal adjective [ Ento- + Greek ... the tongue.] (Anat.) Within the tongue; -- applied to the glossohyal bone. 
entoglossal Within the tongue; applied to the glossohyal bone (both the hyoidean arch and the tongue). The hyoid bone is a U-shaped bone at the base of the tongue that supports the tongue muscles.
The bone (part of the hyoid apparatus) that supports the tongue; also called the tongue bone.