Hyosternum \Hy`o*ster"num\, n. [Hyo- + sternum.] (Anat.) See {Hyoplastron}. [1913 Webster]
Hyopastron \Hy`o*pas"tron\, n. [Hyo- + plastron.] (Zool.) The second lateral plate in the plastron of turtles; -- called also {hyosternum}. [1913 Webster]