1) The tongue bone 
the tongue bone 
Glossohyal is the term used in fish anatomy for the tongue and hyoid bone. It is the lingual plate, which is a dermal toothed bone that covers or fuses with the basihyal. The glossohyal changes its proportions when the fish increases in size. ...
• (a.) Pertaining to both the hyoidean arch and the tongue; -- applied to the anterior segment of the hyoidean arch in many fishes. -- n. The glossohyal bone or cartilage; lingual bone; entoglossal bone.
Glos`so·hy'al adjective [ Greek ... the tongue + the letter ....] (Anat.) Pertaining to both the hyoidean arch and the tongue; -- applied to the anterior segment of the hyoidean arch in many fishes. -- noun The glossohyal bone or cartilage; lingual bone; entoglossal bone. 
Type: Term Pronunciation: glos′ō-hī′ăl Synonyms: hyoglossal
the tongue bone