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The Collaborative International Dictionary
Mesosternum

Mesosternum \Mes`o*ster"num\, n. [Meso- + sternum.]

  1. (Anat.) The middle portion, or body, of the sternum.

  2. (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.