A median ossification back of the lophosteon in the sternum of some birds.
A median ossification on the back portion of the keel-bearing part of the sternum in Birds.
[Greek] A median ossification on the back portion of the keel-bearing part of the sternum in Birds (zool.).
[=u]-ros't[=e]-on, n. a median posterior ossification of the sternum of some birds. [Gr. oura, tail, osteon, bone.]