The ventral bit of the middle portion associated with the thorax.
the center portion, or human body, of sternum.
The ventral little bit of the middle segment of this thorax in pests.
In structure, the piece or items of a breast-bone that has several sections lying involving the presternum in addition to xiphisternum: stated mainly associated with segmented sternum of animals.
In entomology, the ventral or sternal sclerite regarding the mesothorax; the under region of the mesothorax, opposite the mesonotum.
How would you define mesosternum?