Webster's Revised Unabridged Dictionary · 1913

Hyosternal

Hyosternal , adjective

[Hyo- + ternal.]

(a)
(Anatomy) Between the hyoid bone and the sternum, or pertaining to them; infrahyoid; as, the hyosternal region of the neck.
(b)
(Anatomy) Pertaining to the hyosternum of turtles.