The Collaborative International Dictionary
Mesosternum
Mesosternum \Mes`o*ster"num\, n. [Meso- + sternum.]
(Anat.) The middle portion, or body, of the sternum.
(Zo["o]l.) The ventral piece of the middle segment of the thorax in insects.
Wiktionary
mesosternum
n. 1 (context anatomy English) The middle portion, or body, of the sternum. 2 (context entomology English) The ventral piece of the middle segment of the thorax.